Where the Nexus 5 falls flat (and indeed, all Android phones) is that some iPhone applications are still more polished than their Android equivalents. I suspect this is more to do with the developers than the actual handset / OS, but one of the reasons I moved from Android to an iPhone back in the day was due to a much better app store. Android has come on massive leaps and bounds since those days and I much prefer the Google Play Store to Apple's offering, but Android still lags behind Apple in some areas. For example, the Android Sonos app simply sucks compared to iOS version, Instagram is also not as good as it is on iOS. Android is also missing a lot of tablet optimised apps - ebay, IMDB and Sonos are three that come to mind. I expect that this'll change eventually.