1. KZ is also full 1080p, where Halo isn't.
2. hahaha which 8th gen fps games look worse than Halo 2: A? Not Battlefield 4 or Hardline, not CoD: AW, or Battlefront, or Destiny, or Wolfenstein, or Farcry 4...
Bold: I guess that's true, you could argue that. Just like I could argue that Halo 3 looks better than Halo 5. I mean, we'd both be demostratably wrong...but we could argue those points.
You see your basing the game off its resolution. Remember Halo 2 not only looks as good as games like Destiny but its a rock solid 60 frames which Destiny isnt and basing from facts and logic, a 30 frame game will look better then a 60 frame game. Halo 2 runs 20 frames smoother then Killzone SF and if they made Halo 2 30 frames then it would have achieved a full 1080p while the only way Killzone could achieve 1080p/60 was to reduce the resolution in multiplayer ands still couldnt average 60 frames.
Now i am not saying Halo 2 is the best looking FPS game on the market but if you see it in action or watch clips, its a very beutiful game to look at, just like the other FPS games that struggle to hold a 60 frame rate.
In my opinion Halo 2 looks just as good as Killzone, and judging from the links iv sent you, there isnt much between the two games except Killzone went for more the cinematic style while Halo went for more the in-your-face style.
You can say Halo 3 looks as good as Halo 5, but thats just laughable and childish.