ok, same hp as panzer IV. better?
depends on how they arrive. If they get rid of the dopey 2 tank call-ins and make the t34/85 either an upgrade, buildable unit, or able to be called in individually I dont think giving the soviets an equivalent to a p4 is good for the meta.
An interesting choice for this tank might be to increase its anti-tank ability while decreasing its AI ability when the 85mm gun is installed. That way both t-34 variants will have a purpose and the t34-85 isnt just the no brainer choice over a /76. It could build from the t4 building, or be an upgrade on the t-34 enabled by the construction of the tier4 building lets say.
T70 - fast anti infantry
T-34/76 - fast anti infantry, light anti armor
T-34/85 - fast anti tank, light anti infantry
Su85 - tank destroyer
Su76 - anti infantry, buildings, support teams, light anti armor
The t-34 fills the role of a "glass cannon". Its speedy and has nice ganky dps, but shouldnt go toe to toe with a panther or even a p4 solo and expect to win.