In Tiger I've been killed with one shot by Panzer.
Two nights ago I hit a M8 point blank range 3 times with AP rounds from Tiger and it still was not ded, in MA.
I've observed interesting activity in the arenas: either there are difference in performance of vehicles and aircraft due to quality of pcs and graphic cards and ISP connections as to perk planes and vehicles underperforming non-perked ones or other issues are occuring under gaming the game. I stay away from the perk rides usually and ride the higher value ENY ones.
All the tanks have critical places to aim at to take them out in one shot. I bailed out into a tank battle and killed a Panzer with my .45 with 5 shots. Actually, quite fun doing that.
Sad to admit, though, it really boils down to knowing the game and what works. Some guys are just dam good!