I can tell you these screenshots do not do this game justice. First of all we are comparing an alpha build which is unfair and second of all I have the ViDoc downloaded in HD quality with Dolby Digital sound on my 360 and it looks beautiful and sounds fantastic.
Another thing. Killzone may look amazing but it's certainly not without it's flaws due to the limitations of the PS3 hardware in certain areas. Quite a lot of low res textures (there's only 256MB of ram to play with), the application of Quincux AA which while it smoothes off most edges very nicely, it also blurs every texture giving it a dull look. Also low res alpha effects due to the PS3's limited bandwidth (though the explosions are well animated), long load times thanks to a lack of an option to install (only a 2 x Blu Ray speed) but worst of all in order to achieve the high graphical standards it frequently suffers from slowdown. Now a lot of it is minor in nature but it happen quite often which is quite annoying.
Halo Reach isn't going to suffer from any of those though it might not have as good AA and lower resolution. Also Reach will have far bigger open spaces to fight in with a lot more enemies (that don't respawn), better better AI and more variety in the levels with much more colour. That's what Halo is about- FUN. I just hope that Bungie stick to it's rock solid 30FPS we are all used to even if it means sacrificing visual fidelity. Though it looks better than Halo 3, it's still a (massively) upgraded Halo 3 engine, not a brand new graphics engine.
Also there's no character in Halo as annoying as Rico 
Let's hope Reach is the same!
