How many times do we have to discuss DPS vs TTK in tank vs tank comparisons ?
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This the same set up and thus DPS is very good indicator and in addition it simpler to use.
If you want TTK you need to put accuracy into play and compare probabilities. For instance how much is that TTK that unit A will kill unit with in this time frame with 90% probability.
Why do you post them then implying that they are a good way of comparing units if you already know that they are heavily inaccurate at best? ...
For economy in time and space. I am not going to do a full statistical analysis when I am not really interested how much better the new SU-85 bad the simple fact that it is better.
Let me use another method thou that will bring us to the same result:
Lets arbitrary assume that half the missed shots score collision hit.
The old SU-85 firing on OKW PzIV has a 50% chance to score a hit we increases to 75% since half of that shot collide.
It also has a 77% to penetrate and that bring the total chance of doing damage to 0.58. So the probability of killing a PzIV with only four shots is around 11%.
The new SU-85 firing on OKW PzIV has a 80% chance to score a hit we increases to 90% since half of that shot collide.
It also has a 94% to penetrate and that bring the total chance of doing damage to 85%. So the probability of killing a PzIV with only four shots is around 51%.
One can factor in ROF advantage but it will not reverse odds like these and it is simply too much work since one would have to calculate for a similar probability.
The fact is that SU-85 might had great ROF but had terrible accuracy and since it is case mate and had less rotation I doubt that it could even take advantage of that ROF unless on certain map.
So the result is the same the new SU-85 is simply superior vs mediums unless one have the RNG GOD on your side. The question of how much better is hard to establish and not worth the effort.