This thread is getting a bit fan boi-ish... Anyway wp whilst not the finished article, offers a different UI than apple iPhone.. Its also cheaper.
HTC one is a beautifull bit of kit.. Its also expensive and not without its criticism ( blink feed, camera capability in daylight,)
Galaxy s4 is also expensive, cheap looking device which looks near identical to its predecessor, it also suffers in poor lighting conditions compared to its competitors, it also lags it certain scenarios through the UI despite being the most power full phone ever made.
I handled a lumia 920 the other day and liked it apart from the bulk, lumia 925 looks like a competitive product from where I am.