Bastion:  All of Hanzo's Storm Bow shots can be devastating to a Bastion Sentry as you can fire them from long distances and since a Bastion Sentry is stationary, it will be very easy for Hanzo to aim and fire at him dealing a lot of damage in return.

Remember the closer you get to a Bastion Sentry the more damage he will generally do to you than you will do to him, so keep your distance if you can.

You can fire a Sonic Arrow on Bastion which will stick to and follow him even if he relocates elsewhere, which will make it easier for you and your team to know where he is at (for a brief time).  Remember Sonic Arrows will also do damage like a normal arrow as well.  Hanzo's Scatter Arrow shot at the ground in front of a Bastion Sentry is an easy target and will deal a large amount of damage to him too.

Dragonstrike is very powerful against Bastion.  Dragonstrike travels across the entire map (even through walls) and does insane DPS to anything in its path.  This can either kill a Bastion Sentry or force one to move around to avoid it, thus giving your team an easier time to push forward.

Zenyatta:  Zenyatta is not too much of a threat to Hanzo.  Zenyatta is a relatively slow moving hero and is not too hard to hit with the Storm Bow.  Scatter Arrow shots at the ground in front of Zenyatta can be difficult to aim because Zenyatta floats in the air a bit and the Scatter Arrows can actually go underneath of him and miss.

The worst thing Zenyatta can do is put a Discord Orb on you, and even then Hanzo is usually not a prime target for Discord Orbs.  Hanzo can climb walls to potentially help him get behind a wall to remove the Discord Orb but other than that Hanzo is very susceptible to additional damage done by the Discord Orb.

Zenyatta's slow mobility makes him a bit more susceptible to Hanzo's Dragonstrike, but he does have option of using his ultimate Transcendence to save himself and potential allies from it.

Mercy:  Hanzo does well against Mercy since he is able to shoot long distances along with being able to see behind walls.  Mercy tends to hide behind corners and tries to stay out of the line of sight from her enemies, but Hanzo is able to use his Sonic Arrow to see behind walls enabling him to line up shots faster once she comes in contact with him.  While being able to see behind walls, Hanzo can also attempt to ricochet Scatter Arrows behind walls/corners in hopes to take her out as well.

Torbjorn:  Torbjorn is another slow moving hero that is relatively easy to hunt down for Hanzo.  Torbjorn is often found repairing or building turrets usually next to a wall for him to take cover.  With Sonic Arrow, Hanzo can see him before he pops around the corner to repair his turret, giving you an easy opportunity to head shot him quickly when he comes in contact.  Scatter Arrow can also be used to ricochet off of walls in hopes to take Torbjorn out before he finishes building/repairing his turret.

Torbjorn's turret is immune to a Dragonstrike, but Hanzo has a relatively easy time taking turrets out simply with charged bow shots.

Ana:  Hanzo counters Ana in similar ways how Widowmaker counters Ana.  Hanzo can snipe from a distance doing more impressive damage with potential headshots (Ana does no headshots).  Sonic Arrows enable Hanzo and his team to spot Ana behind walls making it easy to snipe her when she pops in view.

Ana's poor mobility makes her an easier target for Hanzo's Scatter Arrows, but as long as Ana keeps her distance from Hanzo she should be safer from Scatter Arrows.

As Hanzo revs up a bow shot, he moves considerably slower, which is a better chance for Ana to land a Sleep Dart on him during this time, but since Hanzo and Ana are both long distance snipers, overall it will still be difficult for Ana to land a Sleep Dart on a target that is far away.  Although Ana will have an easier time landing a Biotic Grenade on Hanzo which will prevent healing on Hanzo for a short period of time while also doing some damage.

Since Ana snipes from a distance she is generally a bit safer from Hanzo's Dragonstrike, but Ana's poor mobility will make it extremely difficult for her to escape from a Dragonstrike if caught in the midst of one.

Ana's ultimate Nano Boost can be very effective against Hanzo.  A Nano Boosted enemy will have a much easier time honing in on Hanzo to take him out.

Roadhog:  Since Hanzo is not a close up combatant, he does well against Roadhog since he is usually out of reach from Roadhog's Chain Hook.  Sonic Arrow further helps Hanzo stay out of Roadhog's reach and helps him to aim and ricochet Scatter Arrows at the same time at him.  If Roadhog does actually manage to Chain Hook Hanzo in, Hanzo will most likely die as there is not much he can do about it except fire a Scatter Arrow, which won't do much to Roadhog.

To get away from Roadhog's deadly Chain Hook more effectively, you can do rapid fire shots at him to enable you to back away from him quicker while still doing some damage.

Since Roadhog is a slow moving hero with poor mobility, it's generally very easy to aim bow shots at him, and Roadhog will have a harder time dodging Hanzo's Dragonstrike due to his poor mobility as well.

TIP:  When Roadhog uses his ultimate Whole Hog, he will be forced to move very slowly until the 6 second duration is up, this would be a great time to launch a Dragonstrike at him to finish him off, since he will be unable to avoid it in time.

Reinhardt:  Reinhardt's shield is the main reason why he is tough to deal with for Hanzo.  His massive shield protects everyone behind it from Hanzo's Storm Bow.  The fact that Reinhardt can move closer to Hanzo while having his shield out makes Hanzo an easier target for Reinhardt's Charge ability.  As Hanzo do the best you can to get as high up as possible from Reinhardt (use wall climb).  When you are high up you are protected from most of Reinhardt's abilities, including his deadly close range melee attacks, Charge ability, and safe from his ultimate Earthshatter.  Reinhardt has no vertical mobility so that is another reason to stay elevated away from him.  You just need to watch out for Reinhardt's Fire Strike ability, which he can use every 6 seconds.  Fire Strike travels in a straight line and you will need to strafe around to avoid it properly.

If you find yourself on the same ground level as Reinhardt and he is approaching you, that would be a good time to back away from him while doing rapid non-charged bow shots, so you can move faster (but do a bit less DPS).  If Reinhardt gets too close to you he can use his Rocket Hammer to knock you down or even Charge at you close up easily.

When trying to shoot down Reinhardt's shield, you will be able to do more DPS by doing fully charged shots.  Your DPS will drop the less charged up your shots are.

A Dragonstrike can be used to temporarily make Reinhardt move out of the way, disabling his shield for a short period of time, enabling your team to do some good damage for a short while.

Winston:  Winston's Barrier Projector (shield) does a good job of protecting his team from Hanzo's Storm Bow shots.  Winston's Jump Pack ability allows him to quickly propel himself in close range, where he can do some serious damage to Hanzo and his team with his Tesla Cannon and Primal Rage (ultimate).

As Hanzo, keep your distance from Winston and if he leaps at you, use a Scatter Arrow shot on the ground in front of him and try to keep backing away from him.  If you can, quickly climb a wall next to you, it should give you enough time to escape before Winston can use another Jump Pack.

If there is a lot of enemies inside of Winston's Barrier Projector, consider firing a Dragonstrike at it to force all the enemies to scatter out of the barrier.

Genji:  Brother Vs Brother, who wins?  Overall I think it's a pretty close matchup, but I think Genji has the advantage thanks to his Deflect ability.  Deflect can be used to deflect arrows back at Hanzo to kill him.  Genji would need to time Deflect very precisely though which can be a bit difficult.  When fighting a Genji as Hanzo, keep strafing, that way you will avoid being hit by deflected arrows.  Scatter shots to the ground in front of Genji can be an effective way of taking Genji out, but Genji can do double jumps in the air which can potentially avoid Scatter Shots to the ground more easily.

Genji is also a good target for sticking a Sonic Arrow on him, allowing you and your team to track his whereabouts for its duration.

For 1on1, Genji's ultimate Dragonblade is more effective than Hanzo's Dragonstrike.  Genji can Deflect the initial arrow from Hanzo's Dragonstrike, sending it back at Hanzo and turning it into a Dragonstrike for Genji's team (it's rare to see this though).  But Genji cannot Deflect the actual twin Dragons once deployed.

Tracer:  Tracer is a tough fight for Hanzo, it's incredibly difficult for Hanzo to hit fast & small moving objects with his Storm Bow. One would need to be really good with Hanzo (lots and lots of practice) to get better at shooting down Tracers.

If you can, try to shoot a Sonic Arrow on Tracer as it will follow her, allowing you and your team to see exactly where she is at.   Unfortunately though, Tracer can dispel the Sonic arrow from her by using Recall.  The dispelled Sonic Arrow will drop to the ground and continue to provide infra vision for its remaining duration.

Tracer can easily avoid Hanzo's ultimate (Dragonstrike) by blinking away from it, but Hanzo will most likely die to Tracer's Pulse Bomb, as there is not much Hanzo can do about it.  However, I predict when it comes down to high level of play, this will become more of an even fight between the two.

Widowmaker:  Sniper Vs Sniper?  This is an interesting matchup and I believe that Widowmaker has the advantage here simply because her sniper abilities are simply more superior in long range snipe battles.  However, the closer Hanzo gets to Widowmaker the easier it will be for him to take her out.  Since Widowmaker is usually way in the back from her team and away from Hanzo, she doesn't need to worry too much about a Hanzo shooting her down (even though it can happen).  There are numerous places in Overwatch that Widowmaker can use her Grappling Hook to get up to that Hanzo cannot climb to, thus giving her more of a safe advantage over Hanzo in those situations.

On the bright side for Hanzo, he doesn't usually need to worry about Widowmaker's Venom Mines, since her mines are mostly used for dealing with offensive heroes that try to get close to her team.

Hanzo's ultimate Dragonstrike happens to be somewhat useful on Widowmakers, since it forces her to leave her current sniping spot to find another one, temporarily disabling her from combat for a short period of time, which can be huge.

Reaper:  Hanzo is one of Reaper's prime targets to take out.  Reapers are very deadly to Hanzo thanks to his sneaky mobility with Shadow Step (teleport) and Wraith Form (invulnerability).  If you know the enemy has a Reaper, always be on the lookout for getting flanked from behind.  Make sure you stick with your team so they got your back and fire Scatter Shots at the ground in front of Reaper to hopefully take him out before he uses his shotguns on you.  If you see him coming at you from a distance, remember you can always wall climb yourself away from him if possible.

Use Sonic Arrows to detect Reaper from flanking you and be prepared to take him on if he approaches.  If you see Reaper using Shadow Step, get ready and fire a charged bow shot at his head when he teleports in, it could be an easy kill for you.

You can fire a Sonic Arrow on Reaper to track where he is at, which can potentially warn you and your team if he gets close too close.  But keep in mind his Shadow Wraith ability does remove the Sonic Arrow from him.  The dispelled Sonic Arrow will drop to the ground and continue to provide infra vision for its remaining duration.

Reaper can avoid a Dragonstrike by using Wraith Form to escape it safely.  Unfortunately if you are close to Reaper when he uses his ultimate Deathblossom, there is nothing you can really do about it except try to either run from it, head shot him quickly to take him out, or Scatter Arrow shot to the ground in front of him.

Pharah:  Shooting Pharah down as Hanzo can be very difficult, as aiming at her while she is moving around in the air can be hard to land shots on.  While revving up Storm Bow shots Hanzo moves a bit slower, thus making it easy for Pharah to fire rockets down at him.  Pharah can also use a Concussive Blast on Hanzo if she needs to either reload or knock Hanzo around to protect her from bow shots.

A good Hanzo player can be devastating to a Pharah.  With good aim, Hanzo can shoot Pharah down from the air more consistently, but this will take a lot of practice.

Sonic Arrow makes it easier to spot a Pharah's movement behind walls.  This can make lining up a shot easier for him and his team.  As Hanzo, you need to watch out for Pharah possibly flanking you from behind.  Use Sonic Arrows around choke points leading up to you, to see if enemies such as Pharah tries to sneak up on you.

Pharahs tend to be out of range of Hanzo's Dragonstrike, since she is usually flying around in the air.  But Hanzo will need to watch out for Pharah's ultimate Barrage since his mobility is not the greatest for avoiding it.  When Pharah uses Barrage, Hanzo can fire a headshot on her to take her out with one shot (as long as she is not protected in some way).

McCree:  As long as Hanzo keeps a distance from McCree he does very well against him.  Hanzo's climb ability helps him to further keep a distance from him.  Although if Hanzo gets too close to McCree it could be a quick death for Hanzo, due to McCree's deadly close up Flashbang and Fan Fire combo.

If McCree uses his ultimate Deadeye and you have Dragonstrike ready, quickly get behind a wall to take cover then fire the Dragonstrike at him to maybe take him out and/or make his team scramble away making McCree an easier target to deal with.

Sticking a Sonic Arrow on McCree is an effective way at warning your allies if he gets close to flashbang them.

Mei:  Don't under estimate the power of Mei's Ice Wall.  Her Ice Wall can shield herself and her teammates from Hanzo's Storm Bow shots allowing her team to move closer to the objective, or preventing the other team from guarding the objective.  Keep in mind that an Ice Wall can be completely destroyed by one of Hanzo's Dragonstrikes after a few seconds.

As Hanzo, you may find yourself coming in close contact with Mei trying to freeze you with her Endothermic Blaster, which can be very deadly.  Your best bet in this situation is to aim a Scatter Arrow at her to hopefully kill her or at least force her to use a Cryo-Freeze to disable her for a few seconds.  You can also get away from Mei's freeze blaster effectively by doing quick non charged up bow shots to enable you to back away from her quicker while still doing some damage at her.

Mei's ultimate Blizzard can be tough to deal with for Hanzo.  Run away from it if you can and you should be fine, and remember you can climb walls to help you escape it.

If you can climb really high up away from Mei you will generally be very safe from her, as she can't do much to you when she is further away from you (besides Icicle shots).  Keep in mind she can use her Ice Wall to propel herself upwards a bit to get to higher spots, but Hanzo can still climb higher.

Soldier 76:  This is an even matchup.  Soldier 76's Pulse Rifle is great for short to medium range, but his damage starts to drop off at longer ranges, giving Hanzo the advantage from long range.  If Hanzo keeps his distance from Soldier 76, he will have an easier time dodging his Helix Rockets and take less damage from his Pulse Rifle.

In short range, Soldier 76 becomes more deadly, but Hanzo can always shoot a well aimed Scatter Arrow at him to potentially take him out.

Soldier 76 can avoid a Dragonstrike by sprinting away from it.

Soldier 76's ultimate Tactical Visor can be deadly to Hanzo.  Hanzo can try to avoid Tactical Visor's aimbot by losing line of sight with him, possibly by climbing away.

Junkrat:  Since Hanzo doesn't have any super fast movement abilities he is less prone to getting trapped by Junkrat's Steel Trap or Concussion Mine, even though it can happen.  If you know the enemy has a Junkrat, just be on the lookout for his traps and mines laying around on the ground and you should be fine.

Junkrat's Frag Launcher spam can be annoying for everyone, but remember Hanzo can always climb walls to get to spots where Junkrat may not think about spamming his Frag Launcher at.  Speaking of staying at higher grounds, that is generally a better place to be to avoid Junkrat's ultimate Rip-Tire.  Even though Rip-Tires can climb walls, not many Junkrat players steer Rip-Tires up walls, at least from what I have observed, but at least watch out for it!  Remember, a good Scatter Arrow shot to the ground in front of the tire will have a good chance at killing the Rip-Tire before it reaches you.

Another deadly ability that Hanzo can do is use a Sonic Arrow to spot Junkrat behind walls, and he can then attempt to shoot a Scatter Arrow to ricochet in his area to knock Junkrat out.

Lucio:  Lucio himself isn't much of a threat to Hanzo, but his crossfade team auras can give Hanzo an overall much harder time.  Hanzo already has a tough time aiming at his enemies with his bow, imagine all his enemies with much faster movement, it becomes so much harder to hit enemies, that's why Lucio's amplified movement speed is devastating to Hanzo.  Lucio's amplified movement speed also helps his team escape from Hanzo's Dragonstrike ultimate.

Lucio should be a prime target for Hanzo, as it's important to remove his team auras as often as you can.

When you hear Lucio use Sound Barrier, you are better off just taking cover for the next 5 seconds until their shields wear off.  This would be a good time to reposition somewhere else to confuse the enemy of your whereabouts.

Symmetra:  Symmetra usually stays in the backlines while putting up Sentry Turrets and lobbing slow moving Photon orbs at her enemies, and is usually out of Hanzo's sight most of the time.  If Symmetra gets close to Hanzo her Photon Projector can be a pain to deal with as it will auto aim at you and it can be hard to fire bow shots at her during this time.

Sentry Turrets are probably the second biggest threat to Hanzo because they can be hard for him to shoot down with his bow and his lack of fast movement abilities will make it harder for him to avoid them.  If you know there is Sentry Turrets in a room, you can fire a Scatter Arrow in there with the hopes of knocking some of them out. 

Keep in mind that Symmetra's Sentry Turrets and Teleporters are immune to Dragonstrikes.

Hanzo is usually not a Teleporter hunter as that is a job for offensive heroes with superior mobility, so that is another advantage for Symmetra.  Although Hanzo's Sonic Arrow could potentially spot Symmetra putting down a Teleporter behind a wall.  This can be tough to deal with for Symmetra because enemy Sonic Arrows have no indication that it was used on the battlefield.

A good way to spot a Symmetra, is to see exactly which angle her Photon Orbs are flying at you, just trace it back and you should see Symmetra in the distance.  Shoot a Sonic Arrow in her area and use some good charged up long ranged shots to take her out when she peeks within view to lob her photon orbs.

Hanzo:  Fighting another Hanzo comes down to who has the better overall aim with the Storm Bow and who can pull off their Scatter Shots better.  Sonic Arrows also really help when dealing with opposing snipers such as Hanzo, as it will allow you to start aligning shots while taking cover.

Zarya:  Zarya isn't too much of a threat to Hanzo due to her weapons being mostly short and medium ranged, but she is one tough chick to take down.  As a tank with a lot of HP, it's going to take a number of well aimed shots to take her down.  Zarya can put a Particle Barrier on her and one on her teammates occasionally.  Don't shoot at these Particle Barriers because they will block and absorb damage, then turn it into energy for her weapon, making it stronger.

Zarya's ultimate Graviton Surge clumps her enemies together and can be rough for Hanzo, as he has no counters for it.  The best way to deal with her ultimate is to try not getting stuck in it in the first place by splitting up a little bit from your teammates.  Find a higher ground or another area to shoot from to avoid being pulled in by her Graviton Surge.

Zarya's Particle Barrier will block and absorb Hanzo's ultimate Dragonstrike, but a Particle Barrier will not fully protect Zarya (or an ally with a barrier) from a Dragonstrike, as Dragonstrike actually does a damage over time effect, in which it can take down her Particle Barrier and then quickly eat away at the actual hitpoints.

D.va:  D.va is another tough tank that will take a number of shots from Hanzo.  D.va doesn't really have anything too brutal for Hanzo to deal with but you will need to keep your distance from her as best as you can because her Fusion Cannon weapon becomes stronger in closer ranges.

To get away from D.va's deadly Fusion Cannons up close, you can do rapid fire shots at her to enable you to back away from her quicker while still doing some damage at her.

Remember when her mech is destroyed, the little D.va will pop out of her mech and you will then need to kill her too before she calls up another fresh mech.

D.va can use her Defense Matrix ability to block and absorb the initial arrow of Dragonstrike, but once the actual Dragon gets deployed it cannot be blocked/absorbed by Defense Matrix.