Battery, build quality and form factor are not better for the iPhone. Battery's about the same, build quality is similar, but iPhone loses points for being either easy to scratch (black 5) or easy to crack (4, 4S). Apple in general makes stylish but not robust phones. iPhone loses on the form factor because it really has only one that is acceptable - the 5. I am typing this on a 4s and the screen is too small and the shape does not feel as good in the hand as the round polycarbonate Lumias.

CPU and GPU don't seem to be so different subjectively. Both are smooth.

The apps are vastly better on iOS, even the ones that are on both platforms e.g. one cannot insert rows in Excel for WP 7 or add annotations in Kindle. Support seems better for Apple, as Lumia 800 and 900 customers did not get WP8, while the older iPhone 4 will get iOS 7!