I'd actually agree to an extent, but trying telling some PC guy's that. To them, BF3 console, or choose your console version here, might as well be an 8 bit Nintendo game or something. Never mind the horrors of 30 FPS and lowly 720P (which I have to agree, after watching my brother PC game a lot, I am ready for a move to 1080P, which 720P never bothered me before).
In other words ironically I'm typically on your side, arguing that the console version of game X is not THAT far behind the PC version. I'd even argue that for BF3, to an extent. I think this because PC ports are based on the console versions though, not because of any diminishing returns factor.
But I was speaking of Crysis 3 anyways, and again, that trailer, just the textures alone...you run that in 1080P and I think you're in the ballpark of next gen. Though I think next gen will far exceed it eventually (IE, what Killzone 2 was to 1st gen 360 games)
Watch Dogs and Star Wars 1313 are other good examples of sort of next gen, running now. They impress me much much more than say, UE4 demo because they are real.