Am I the mere one that thinks that the Killzone 2 sales are a bit disappointing? 726k in four days is not something bad, I agree, but this is actually Killzone 2 – the Halo on PlayStation!
Anyway, fastest-selling FPS' on PlayStation 3 :
Call of Duty: World at War - 736k in 4 days.
Killzone 2 - 726 in 4 days.
CoD: MW - 445k in 4 days.