CVG
Diminishing returns mean that many next-gen titles have failed to provide sufficient visual wow (so far at least), but that's not the case with Turn10's latest.
It looks like a genuine, bona fide next-gen title, and visually it leaves PS4 rival Drive Club (an intriguing game in its own right, but that's another story) in the dust.
http://www.computerandvideogames.com/413689/previews/forza-5-czech-yourself-before-you-wreck-yourself/
Digital Foundry
Sony's press shots for DriveClub look pretty cool, but despite some neat features such as proper vehicle deformation and some beautiful lighting, the low quality, blurry textures looked a world apart from what Forza 5 was achieving running at twice the frame-rate.
http://www.eurogamer.net/articles/digitalfoundry-hands-on-with-playstation-4