The iPhone 5 because of its sheer popularity and competence has become the defacto standard to which new challengers can be, and are generally compared with. The Lumia 928 on paper seems like the better camera phone, it has optical image stabilisation, 3 high amplitude capture (HAAC) mics to give you distortion free sounds even when you’re shooting in loud places like concerts and finally, it has a wider field of view while shooting videos. The iPhone 5 crops the sensor when it switches to the video capture mode, so if you’re standing at the same spot and shooting video from the iPhone and the Lumia, the Lumia will get you a wider field of view.
The following videos have been shot in the default mode, and should give you a good idea of how both of these devices pan out.
I tried to keep both phones as stable as possible, so the distinct advantage of having OIS on the Lumia might not be immediately clear, but if you listen to the audio using a headset (anything apart from the regular laptop speakers) the difference in quality is abundantly clear. The Lumia sounds quieter, but is of higher quality. The difference in the field of view becomes clear immediately when I switch phones.
The one thing that I like about the iPhone is that you can tap the screen to adjust the exposure, and that’s really useful. On the Lumia, you’ll need to adjust the settings beforehand. Secondly, there were occasions where the Lumia was focus hunting, but this can be taken care of by turning continuous auto focus off from the settings.