Yes, but then I have paid (2x)50 munitions and upgraded the 2 Panthers with MG-42s, that should matter. The 2 MG-42s on the Panthers should have a greater impact. They should pin down the infantry in the same way as the regular MG-42s do.
Would be broken as hell, it's a fast-moving well-armoured unit with good penetration on its main gun. Suppressing with an upgrade would make well-microed ones basically beat anything.
Well, really, pintle MG upgrades suppressing on pretty much any tank would be broken as hell. Most tanks would then require their players to be super dumb to ever get hit by infantry's engine-damaging AT abilities (or possibly even AT weapon upgrades), since all of them can get away from said infantry all right currently anyway if they see them coming, and so the tanks will be laughing at anything on foot that isn't an AT gun.