Firstly, I wanted to say I absolutely love my WP and I'm not switching for as long as WP lives... buuuut...
Without spending too much time on narrative here is what I came up with:
My Lumia 920 is not as SMOOTH as the iPhone 5s. The menus scroll smooth as butter on the 5s, while they're a little choppy on my 920, and when i scroll quickly they seem to blur as they move...on the 5s they don't. It's not big, its not functional...but it just doesn't feel as nice.
My Lumia 920 is not as CLEAR as the iPhone 5s. The screen on the 5s is much clearer. I can't really explain it, the edges are just as clean on the 920 (both ~330ppi)...but it just doesn't LOOK as nice! Does anyone else have any idea what I am talking about?
My Lumia 920 is not as "complete" as iOS. I don't expect WP to be quite up to speed with iOS yet as it is drastically younger (2 years old for WP vs 7 years for iOS - a fact people seem to overlook!). There just seem to be some things that just seem half-baked. It is a "productive phone" with office, however I can't attach a PDF to an email! I can't edit the text of a forwarded email, and I can't scroll the position of video playback. It just...isn't finished.
...just my little rant!