I've yet to see any game that has you, the environment, and the lighting affect nearly every object in a scene on the level that QB does.
A random glass on a table, a doorknob in a back room, or the top of a table in a lab.
Every single one of the above from the floor to the ceiling reacts to you, the NPCs, the lighting. You can see your face, your hands, your gun, effects, reflecting in a cup on a table...a glossy table-top reflects light and objects on it...a metal table will reflect your arm (distorting it with the grain) as it passes near it.
I've never seen anything like it in anything that is coming or that I've played in the past.
Show me (even a video) of another game doing that. I'd agree with the other guy...there's a reason they had to build this game like they did for the X1. I don't think the technical side of it has been really explored like it needs to be.
I was watching X-Files last night and noticed that the way the people in an elevator appear on the metal of the doors and sides matched the way entering an elevator in QB looks.