I do believe that the NL 925 is a top of the line device. I also believe its still better than the 5s.
I can't say much on build quality. Both are great in that aspect.
I prefer the 925s camera to the 5s because of many reasons. It takes better pictures. My use between the two, and watching video comparisons confirms that. OIS helps to trump i5s video taking ability because of less shake and ability to have smoother video; videos that are in less than perfect lighting.
It also has a better screen. Higher resolution, with sun-light readability. Nokia glance screen and things like Pure motion +. IPhone is still great looking, but it doesn't offer these things.
The 925 also has better mics. Making videos, voice recognition, annotating notes, messages, etc that much more enjoyable.
Ios7 just got zooming while recording. 925 been enjoying that for a while.
Lastly, it looks better.