You forgot about the Touch ID sensor. Add in the significantly improved processor and the camera, and that easily justifies the extra $100 for the 5s. I also don't agree that most apps will not benefit from the better processor, as the whole phone and OS benefits from it. Apps open up quicker, games will play better, just about everything will be better. Apps can always be improved, I don't agree that they are already as quick as they need to be.