Its an IS hull, pretty distinctive, noticeably the driver hatch is in the middle of the frontal hull and no MG port. The long barrel with muzzle break is 122mm cannon, therefore an IS-2.
Edit: Oh wait, you are reading left to right. Should have noticed that earlier. Ya, very possibly T-34 judging from the little small part shown.
This reminds me of that run where a couple of T-34-85's KO'd several KT's because of a well placed ambush.
Speaking of which, as tough as nails an IS-2 is because one of its odd jobs is to YOLO into the enemy lines and blast anything extremely dangerous then back away for T-34 spam, I don't know if the KT's KwK 43 could lolpen it frontally even if it did have a thick frontal armor, the Tiger probably has a slim chance of bouncing but it would be fairly funny to know if a KT bounced an IS-2 charging and attempting to la its field gun tank gun
Yeah that's an IS, the T-34 glacis plate goes across the entire front of the tank. (At least the high caliber ones did.) The IS plate has three faces in an odd half-hexagon pattern. You can't really see it in the picture but it might have been an odd perspective or a mistake.
We were talking about the small bit shown in the left bottom corner in the panel with the Panther, not the front view of the very obvious IS-2, in case you guys didn't noticed. And the hull looks darn flat and the driver hatch is different from IS hull.