I have made a very simple point:
C.Panhter performance vs Super heavies is not as cost efficient as the C.Tigers although it has similar cost and CP thus it is UP.
Vs mediums it probably up also compared to the Tiger.
The same probably applies to Croc.
The Ostheer panther probably also is UP compared to Tiger for the same reason.
Now I am not sure what is the point you are tying to make but describing the Panther as "butchering" mediums seem to me as misleading. 2 Stug or 3 Pumas probably "butcher" medium allot faster than a Panther. If Panther has an advantage over this vehicles it is that it can get the kill with loses....
Panther is actually not a cost efficient counter to mediums due to its cost....
The massive Cmd Panther issue in 1v1 rn is how hard it is to reach its potential, since it takes absurd amounts of time to gather enough XP for its auras to kick in, which are extremely useful. Hence why I suggested improving Special Ops by making the Cmd Panther a bit better vs Infantry, about 1.5 times its current anti inf DPS, which should help it not only be a bit more useful in general but also accumulate XP faster for its veterancy to kick in and provide benefits. I really think a faster vetting Cmd Panther could make Spec Ops useful in 1v1 again.