I disagree.
There, nightie shots of both. And that is the absolute best shot of Metro I could find. It's the only way metro stands a chance. During the day, which is most of Crysis, Metro stands no chance. It does look closer here, but I'm really not seeing it when you're in the tunnels and stuff. Plus you have to take into account the games in motion. Metro looks way better still than it does when you're actually playing it.
My rig does Crysis on highest minus AA and AF, but it only does Metro on High without too much of a framerate hit.