I don't think thr T-34/85 would need to be perked.
When compared with the PnZ IV H it would look like this:
Pro:
Faster
Better armored
Better main gun
Con:
No AA capability
Fewer rounds
Poorer optics (if optics modeling is added to AH)
The T-34/76 would look like this:
Pro:
Faster
Better armored
Con:
No AA capability
Much worse gun
Fewer rounds
Poorer optics (if optics modeling is added to AH)
In the context of AH the lack of any AA capability whatsoever is a critical weakness, especially in a perk unit.
I submit that the T-34/85 should be the top end, non-perked, main battle tank.
The first perk tanks should be, IMHO, the Panther V G, the best version of the tank built to kill T-34s.
British tanks would be nice eventually, but for now I think Russian, German and American GVs are the way to go.