Coming from the 4S, I just have to say that I notice a substantial improvement with the 5s's camera. I had my expectations after watching the keynote: a slightly larger aperture, sapphire crystal lens, larger sensor/pixels, and some software upgrades like dynamic exposure and auto image stabilization. These were all moves in the right direction and much better than just cramming in more megapixels like everyone else likes to do. But despite my expectations, I was still blown away by how impressive the 5s is. With the 5s, I'm noticing increased detail and improved dynamic range in all my pictures. Autofocus is extremely fast and happens much more often than before. Shutter lag is non-existent. I am getting sharper images with noticeable improvements in exposure, contrast, and saturation all across the board. It can also do a little bit of HDR without having to actually turn it on. Really impressive. Of course, the other features like burst mode and slow-motion video capture is great too. And the two-toned flash does make for much more natural looking photos, though I still prefer to turn it off. But as far as straight up single shot photos go, there is a huge improvement without you having to do anything. Totally love it.