I've just been watching KZ:M to refresh my memory:
https://www.youtube.com/watch?v=oKKNTujJ9qA
off screen here too.
It was a great looking game but it feels like Doom is in a totally different league now looking at it. It's the atmospheric details and lighting that really tell.
Framerate looks terrible there, Doom looks much smoother from the videos.
I agree that Doom looks great. If Sony released a portable as powerful people would be praising it to high heaven and back.