But I'd argue that technical innovation is not what this phone is about. I've found the iPhone 5S to be the most fun iPhone camera to date. Instead of extra pixels, I'm enjoying the speed, performance, and the new party tricks of burst shooting, slow-motion video, and easier, better low-light shooting. It's the most 'invisible' of the phones, as it just gets out of your way, so you can enjoy what you're doing. If you like shooting on smartphones, I'd recommend that you give it a try.
If getting the best technical quality and detail is important to you, none of the improvements in the iPhone 5S is likely to appeal. Picture quality in good light hasn't improved compared to the iPhone 5 - arguably it's deteriorated a little. Picture quality in poor light has improved considerably, but is still far short of both the quality and usability of a dedicated camera for night photography.