For German (and, I think, Austrailian?) players, remember that the version you buy on Steam will be severly cut, with a lot of gore effects missing, bodies disappear and never get dismembered, no burning infected are visible,and son on. On the plus side, you get one or two weapons that no other version has
If you want the uncut version, you have to ask a steam user from another country to gift the game to your account, this way you'll get exactly the same version he/she uses.