This has nothing to do with any other console, we're talking about two PS3 games here. I actually find the gameplay to be superior in Killzone maybe because it's very visceral in feel or because all I've been playing so far is the multiplayer mode where the objectives change every 4 or so minutes. The game has more of a team feeling and I like that.
I'll probably really enjoy MAG too which I'm looking forward to, hopefully the devs didn't screw it up :P