How long (if ever) will it take for Killzone 2 to surpass R2 sales?

[RPG]

I find that 1.1 million pre-orders alone in the EU very hard to digest, simply does not sound right. Of you add NA sales whom are known to be pro shooters we are looking at a game which would outsell MGS4 first week.

I see that happening with legs, not first week against that front loaded monster.