Soriku:
I honestly don't see the greater detail you're talking about. All I see is a better picture, which can easily be contributed to camera angle and image size.
I mean, look at his hair. It's identical in both pictures. Now, compare with the pictures I linked too - Noctis' hair looks like it's more detailed. The pics I posted may well be CGI, but all the ones you've posted are definately all in-game.