Nice article , but i think the first tank was able to take out a Panther was the SU-152?
That entirely depends on how you define take out.
Allmost any medium tank could take out a Panther when shooting at its front by aiming for the lower part of the gun shield. BY this provoking downward ricochets wich will penetrate the hull roof. It only was a difficult shot and not widely known to allied tank crews.
Neverthe less this was so much of a prople from the German point of view they redesigned the gunshield for Ausf. G.
In the Auf D and A hits to the driver hatch in the glacis plate using 75 mm APCBC shots will likely penetrate.
The lower glacis plate is also thinner and can be penetrated. In most situations its just not visible to another tank.
All medium tanks have a chance of taking a Panther out in a head on engagement. Its not not a big chance though.
The SU-152 is not a tank. Actually its name says what is. Samokhodnaya Ustanovka means self propelled carriage. Its a self propelled artillery piece and not a tank. The SU-152 was issued to artillery units. Its an assault gun.
It the question is wich tank has a good chance to k-kill a Panther with on hit the answer is IS 2.
The IS 2 performs rather poor in tank vs tank duels though. Its a heavy breaktrough tank optimised to fight soft targets (infantry, AT guns), strongpoints and field fortifications. Its ROF is slow, the gun is not very accurate and the firecontroll and C3 is slow. While a IS 2 can kill a Panther with on hit chances are in a meeting engagement the IS 2 would have taken several hits befor scoring one. Concidering the fact that the 7.5 cm L70 can penetrate the frontal armor of the IS 2 at combat distance it is at a disadvantage in a duel.