ya SU85 is greatness.
I dont delve into stats, but in actual plays, i can tell.
I wonder if you flip the question around, how much % can SU85 fire back at panther from 50 range.
Also iirc SU85 rate of fire is better!
Panther has about a third more hp, panther will pen every shot that hits, su85 pens about 88% at vet 0 if i did my math right.
Su85 can selfspot at the cost of speed and mobility and 360 vision. Has no ai and no turret, but 60 range and decent to good rof esp vetted.
The panther has a turret, more armour and hp, ai , a pintle , high pen, 50 range wich is 10 less the su85 but 10 more then medsiums, decent rof to good rof when vetted, heavy crush greatly increasing its mobility, and until vet 3 the panther is faster and turns faster.
So if the su85 is greatness the panther is godlike.