The hardware is impressive in the iPhone 5s and the build quality is excellent indeed, which is very typical of all the previous versions of the iPhone.
That said, as time goes on the top Android smartphones are really starting to show their superiority over the iPhone, in just about every aspect (save for build quality). Power users can do so much more with a quality Android handset, as the hardware is so much more capable. On top of that, the displays on Android handsets are simply much better suited for multi-media tasks.
Additionally, most power users don't fancy the fact that Apple locks their devices down so heavily. You can't even copy over DRM free music to the iPhone by default, while most Android handsets don't even have to be rooted to install apps from untrusted sources, let alone play DRM free music.