You don't see mentions of SU-85 because there is not much to mention here.
It was made bad vs meds and shifted from all round TD to a heavy tank specific counter.
Its less effective post adjustments vs meds while its more expensive and risky, so its always better to get 2x 76 vs med Play then 1 85 which is no longer designed to fight them as effectively.
Only reason to field 85 is against KT, Tiger or Panther.
Su-85 is hardly bad vs mediums, actually the changes made more consistent since they greatly increased accuracy (x160%), increased rotation and give it smaller target size.
Reload is higher but it has better chance to hit and penetrate even vetted PzIV.
SU-85
Accuracy from 0.05/0.0375/0.25 to 0.055/0.045/0.04
Penetration from 200/190/180 to 240/230/220
Reload increased from 3.8/4.2 to 5.4.
Target size reduced from 22 to 18
Rotation rate from 20 to 22
Cost increases from 340 manpower and 120 fuel to 350 manpower and 130 fuel.
Veterancy two -30% reload modifier replaced with +30% weapon penetration modifier.