You're kidding, right? The Wehrmacht used 7.92mm rifle caliber stuff for the serious stuff and artillery and mortars for the rest. Pistol carriers didn't last long in WW II.
Most of the serious killing the Germans did was 7.65mm in the back of the head of helpless civilians.
You were the one who claimed it was the 9mm responsible for German loss.
Actually it is artillery which killed more soldiers in WWII than anything else.
Actually by the end of WWII the Russians were mostly using little .31 caliber sub-machine guns. They proved highly efficient apparently.