The JT and Elefant kill medium tanks in about 18s (but 8,8s with a single faust thrown in) from the first shot and kill a 1040hp heavy in 26,4s from the first shot. They have pretty much double the AT DPM compared to the ISU-152, although this advantage does get neutered against 640hp vehicles because of the overkill damage that's required.
The SU-85 needs about 45s to kill a Tiger I. The Elefant needs 26,4s to kill an IS-2.
At vet 3 the SU-85 needs about 27,4s while the Elefant needs 15s.
The Elefant has far superior DPM, although it mostly loses the advantage against 640hp vehicles because it needs to deal significant overkill damage and needs a third shot to deal the last 40 damage. But as I've said, in case both are supported by infantry who can deal even a single snare worth of damage, the Elefant can kill even medium vehicles almost twice as fast.
Maybe 4v4's are just different, but here is a clip from a 4v4 with a JT and multiple Firefly's. I missed the video of the first shot from the JT, but the life expectancy of a Firefly is about 7 seconds unless they retreat. You'll see one go from Veteran to salvage in that amount of time, with some overkill. That's less time than the ISU takes to switch from HE TO AP. There is only one of the two that I would call "extremely capable" against armor.
The OKW player on my right is probably making threads about how the KT is trash (because he should've been able to A-move it into the three Firefly's and Churchill) and the UKF player is probably creating balance threads on lowering the pop cap of Sextons (so he can have four of them watching his side of the map crumble).
The game isn't in bad shape and these threads aren't necessary or helpful. The only suggestion that seemed good was the one to lower rear armor to 110 max, but that should be done globally to reward flanking.