I’ve been using an iPhone 5 daily for the past year, and the iPhone 5s seems to feel exactly the same: the same curved edges, same dimensions, same everything. It's only an updated Home button and the new camera flash which make you realize that this is not an iPhone 5.  Many people think that releasing the same design twice is bad, and there are others who realize that sometimes there's no need for change. Apple might want to understand that the competition is strong, and it needs to stay relevant. 