A Panther costs as much as 2 T34/85's so why does it always lose? And before you ask I'm counting teching costs for Ostheer and OKW (with the fuel penalty).
Panther does not lose all the time vs 2 T34/85.
You will lose if T34/85 will get behind you, but since Panther is faster, it's not that simple.
If you keep them in front, there is a chance close to 0 that Panther will lose.
Outrange them, better armor, better penetration, better speed.
When you are saying things like that, you can also say that Panther will lose vs 2 T34/76 because if you get behind it, you will lose one T34, but you will also kill Panther; yet how many times have you seen T34/76 killing Panther?