FEAR 2 looks dated. There's some really good use of shaders, blur and depth of field effects... but that's where it stops. The character models, interior environments and texture detail are sub-par in comparison. Even the PC version looks like ass compared to Killzone 2.
I didn't really like the original FEAR. It felt dated even then next to Half Life 2, Doom 3 and Escape From Butcher Bay and the weapon design was. A big deal was made about the AI, but i wasn't ever really impressed by it. The slow-mo gunplay was cool and it had some nice particle affects, but i found the storyline lacking and the whole thing a little washy.
The sequel starts well, although you don't get any idea of where the story is going, and the weapon design is infinitly better, but in terms of visual fidelity on all levels... Killzone 2 stops all over it...
I would qualify Killzone 2 with 'The best looking console game i've ever laid my eyes on...". In pure visual fuck-awesomeness terms, it's obviously not quite Crysis, because Crysis is just godly...
....but that isn;t to say i don't think there are areas where Killzone 2 shits all over Cryteks masterpiece. Art direction, character design, weapon design, animations, hit detection etc are all far superior. I'm even seriously impressed with Killzone 2's texturing... it's extremely good in almost every area.
Whether Killzone 2 is likely to be as popular as Halo 3 or CoD4 (Live) online is another question. PSN still has a long way to go to rival Xbox Live. It's also never going to seel as well as either game, but that doesn;t detract from the fact that it's arguably the most badass shooter on any of the consoles. Will they recoup their development costs in the first year? Probably not. It's never going to be as big as the Halo games or even the Gears games... which is a shame... but i couldn't care either way. As far as i'm concerned the whole 2005 trailer controversy has resulted in them pulling out all the stops and [probably] spending far more than they will have originally have budgeted, crafting an absolutely badass experience.