The graphics are sharper and cleaner, which is to be expected as it is built on a new engine. The look is solid and the animations are crisper, adding to an overall improved look of the game.
Sound is one area I would like to see more attention paid to in stealth games. It seemed to be a little unbalanced, even with the "!" attention meter. Things I thought should tip someone off would go unnoticed, where a quieter noise would gain a lot of attention, depending on the trigger. With that said, I wasn't taken out of the game immersion and the level music where applicable was well chosen.