Panther without HEAT can zone out a heavy but not kill it due to its low rate of fire. KV2 is protected by double 6man zis and lots of cons squads, so you're not chasing it anytime soon. You don't get to say what happens when you switch sides since only the KV2 from all standard 1v1 heavies isn't having its AoE adjusted.
I love this "I only have 1 unit, but opponent always has perfect combination of multiple units to protect his more expensive unit and hardcounter my single unit" type of arguments.
Also, Panthers rof is in line with any other tank destroyer in game, its quite a long time since its like that.