There are two SU 152 actually, atleast under special circumstances same as the Tiger is for reinforcement. Panther performs a bit better than the T34/85 due to it's fire power and accuracy - atleast from my POV, but it is not much actually. Panther is still the best tank in the game for my preference. The german team gets Panzerfaust 30 and the Russian AT layout is nice too so I think the layouts are pretty equal but still interesting with a lot of interesting assets. Some of this stuff can still change so no further info.