Here’s a video comparing the Nokia Lumia 900 against the iPhone 5.
User experience, whilst on different UI have similar performances. The efficient WP7.5 on single core being as nippy as the dual core A6 on the iPhone 5. Purple fringing is noted on the 900. I heard that was a similar purple flare issue with the iPhone 5? Battery life on the 900 is apparently better than the iPhone 5.
Surprisingly the Nokia Lumia 900 holds quite well against the new iPhone 5. However, I’d recommend any potential buyer interested in the 900 to wait a little bit longer for the Nokia Lumia 920. If PhoneArena gives this sort of review right now for the 900, then they’re surely going to love the 920. The 900 is cheaper at 50USD on contract, vs 200USD for the iPhone. This pricing may be closer to iPhone with iP5.