The difference, I suspect, would only be apparent playing PS3 version vs playing PS2 upscaled to an HD TV - it's not going to be huge, but on an HD TV you should get smoother, better image, better AA, etc. plus sharper textures.
But anyone thinking they were going to re-do all the assets to a GoW3 level was kidding themselves.
Try to be reasonable... its easier than you think...







