L. Scofield
Veteran
Particles in KZ2 have very low detail, add to that the whole blurring/add noise to the screen and then there's not much pixelation to see.Like I've mentioned many times before, the particles in Killzone 2 are amazing to look at in motion simply cause they animate so well and there's so much of it on screen (and they are very persistent, as in stay on screen for very long duration). The way people always mention Killzone 2's particles even though it has quarter res buffer just goes on to show that GG did a good job in masking the pixelation and making it as close to being unnoticeable while playing as possible. It also has a lot to do with the animated sprites during explosion, you can have full res particles but if the sprite itself looks poor and out of place then the explosion will look poor regardless of being full res.
C2 goes for a very clean look, which in turn lets the flaws show more.