The whole Su series, excluding the Su-76 and Su-152, are T-34 chassis without a turrent (the T-34 is to the Su, what the PzIV is to the Stug)
The 85mm gun was soon mounted to both the KV (KV-85S) and the T-34 (T-34/85) as soon as the turrents were designed.
Somewhere in this folder there is a link to a Russian armor page with all their AFV (and specifically guns)
They also mounted the 100mm AT gun, and 122mm AT gun (The Su-85 is an assualt gun by designed, but was used mainly for a heavy AT unit, and the Su-100 and Su-122 were built with AT duty in mind)
The Su-152 was a KV chassis, mounting the ML-205, a converted navy gun and was used for a variety of roles.
As with all the monster gun Russian tanks, they didn't carry much ammunition, usually between 15 and 30 rounds.
The Su-100 and Su-122's are the counterparts of the German Jagdpanther (the 122 was near equal but only carried 1/3 the ammunition)
- Jig