I'm definitely tempted.
WP doesn't have apps I want that ios does;
Now TV
Reliable Snapchat
A good music player
BBC iPlayer Radio app
4OD Download feature
Halifax / UK banking apps
O2 priority
Better Microsoft apps on ios, possibility of cortana on ios
Loads of games, ios has xcom!
The novelty of live tiles is wearing off now, and it doesn't help that the notification centre has made them redundant and app developers are increasingly making their tile colours the same as the theme colour which means you either have a screen of identically colour tiles or go transparent, looking at you xbox music and video.
And my htc 8x is really unreliable, I don't receive coms or notifications a lot of the time.
My next phone will definitely be bigger than 5" and I was hoping for the 1520, but since that is getting a bit old now, and Msoft/nokia is taking their sweet time releasing anything new, I'm very tempted by a phablet iPhone, if only so I can reliably receive coms.