I give you a link to a video that expose my point.
Video from real engineering
While that guy knows his engineering, he is pretty bad at engineering. Sure the t34 was better than the p4 at the onset of barbarosa, but the thing is, at that time, the p4 was only armed with a low velocity cannon, the one that the command p4 has.
The version that is in the game, is the upgunned P4 which was developed in response to the t34.
So no it isnt a better tank than the P4 (It could be, but that video sure as shit doesnt prove it)