So Resident evil 5 will release in the same time frame as Killzone 2

[BengaBenga]

Of course this will hurt sales of both titles, but not by a whole lot. RE5 will also be on 360 so should be fine anyway.
Actually I think Killzone 2 will steal a lot of RE5 PS3 sales, because it's a must have PS3 title. This could reinforce the idea that multiplat titles sell more on 360 though, but I think Killzone shouldn't see too much damage.