The lack of 60 range will make it very hard to use against good players because AT guns will be able to drive it off extremely easily.
use some infantry to spot for AT guns
2 stugs with target weak point and a pak or p4 are not that bad. You can target weak point a tank several times and with the buffed pen it is even more better.
I used the stug in Alpha a lot of times, but when you get flanked = rekt
Have you ever played top tier 1v1 and 2v2? In my experience, especially in 2v2, usually we end up with 4-6 85s per opponent. Now dbl that and expect 8-12(considering unit preservation) 85s rushing you with only 4 paks/couple stugs/maybe a tiger. Now watch mark target insta-wreck your tigers and stugs. Then watch as the horde of guards/85s wipe all your at-guns. With a lucky 120mm shell as well. You're gonna be in for one hell of a patch imo. Cpt. Molo will be leading the charge.
Everyone's reaction to watching 85s stream roll into their HQ every game they play: