Cars will look great but I doubt that the environment will be really something special if they show it really so close after GT6.
DriveClub runs only in 30fps which is a huge advantage and has the advantage to be not on race tracks so that they can take full advantage of beautiful streets which look also awesome in real life. I don't think that GT on PS4 would look so much better as DriveClub (except for the cars) if they show it already and I think Uncharted will look much better as DriveClub so that GT would have to be a huge jump to DriveClub and that with 60fps instead of 30fps.
Uncharted will be the best looking game or maybe something which is very linear and "cinematic" to achieve great graphics much easier.














