Resident Evil 4 - Wii Edition brings very little to the system as far as visuals go. The game's look still holds up remarkably well, though nothing is really improved other than progressive scan and widescreen support. Still, the game looks great. Environments present a creepy atmosphere that, when combined with audio cues, really sell the entire experience. A number of little details also show up, like flickering flames or crows flying around the area. Characters are as detailed as they come and have subtle personality traits. Leon has the gait of a trained solider and zombies have a slow-paced, lumbering walk. Another noteworthy feature is that all of the story sequences in the Wii version are done in-game, so there isn't that weird visual transition between game and story sequences.
Sound plays just as big a part, maybe even a bigger one, than visuals when it comes to generating RE 4's atmosphere. The soundtrack is limited to a few low-key melodies while the rest is filled in with gunfire and the moaning chants of villagers. One cool thing the Wii version does is play some sounds, like reloading and swinging the knife, in the Wii-mote's internal speaker. It's a small feature, but it adds so much to the experience that you'll be thankful for the added effort.