I've been using MANUAL for my iPhone 4s over the past few weeks and have been more than thrilled with it's shooting ability. A $2 app that delivers more customizable uses to the camera sensor. I've been shooting less "random" images since downloading this app, as I become more involved in shooting rather than "spraying and praying" (ha, well if you can even do that with an iPhone…?). Thus, the quality of images far surpass anything I would have produced using the phones basic camera app.
(Yeah… I still have a 4s, because it fits in the pocket of my running shorts)