I remember them saying PS3 would be superior day 1 also and we all know how that turned out.
Sony just knows that people will believe whatever they say regardless of if it has any merit or not.
Judging by the fact they are already having trouble getting the PS4 to do what a 4 year old PC can with games like BF I will simply dismiss this claim as PR BS.
I am not suggesting their games will look bad. That's never been the case but they are known to talk a lot and never back it up. 4D graphics comes to mind also.