* Higher PPI and raw resolution
* Better camera
Benchmarks, the Nokia wins with SunSpider...
Even versus the Galaxy S3, when benchmarked with ICS (though the phone was manufactured after ICS and specifically described as being optimized for Jellybean), the results were a very mixed bag (http://news.ycombinator.com/item?id=4558580):
iPhone 5 won in Browsermark, lost in GUImark, and Sunspider.
(That whole article was a little frustrating - many problems with the benchmarking, and the conclusion)
Disclosure: I've had an iPhone 4, 4S, iPad 3, which I recently (this weekend) moved away from to the Lumia 920.