The difference is slightly more than a wii bit when it comes to Gaming Target's comparison between of The Incredible Hulk on next-gen systems and other "next-gen" system. Notice the the decreased muscle definition as well as the barren city detail in the Wii version (the first image) and the higher textures of the true next-gen version (second image).
"The Incredible Hulk doesn't release until early June, in conjunction with the upcoming Edward Norton movie. So, there's some time for Marvel's green superhero to take some vitamin supplements. But here's a quick comparison of how he's shaping up...
Judge for yourself"
