not as big on screenshots but as big when you play the game. on screenshots you don't recognize jaggies so much or bad shadows/lighting. on screenshots you see the details of a face but you don't see how the emotions look better with better tech. on screenshots you don't see if 30fps or 60fps makes a difference but you will recognize it when you play. next gen will be more a "play it to see it" and not so much a "look at the screen to see the improvements"
same with physics and hopefully a.i.







