Not PTR. When they first addressed the Hanzo hitbox issues, Kaplan said they acknowledged that it was a problem, and he worked with the lead gameplay programmer to fix it. It was a fix that went live. Which is what we have right now. The change on PTR -now- reverted adjustment because they felt it wasn't working as intended, before they adjusted it yet again.
http://us.battle.net/forums/en/overwatch/topic/20747185139
"Reduced the chance for larger projectiles (i.e. Hanzo's arrows, Zenyatta's orbs) to hit targets around corners"
https://playoverwatch.com/en-gb/blog/20243886
"Reverted a recent change to reduce size of heroes' projectiles"