I wanted to see which was better at shooting 4K Video. Below is the YouTube video, and the links to the source files for your own comparison.
(Mov= iPhone, MP4 =GoPro)
https://kushari.org/wp-content/uploads/2015/10/IMG_0026.MOV
https://kushari.org/wp-content/uploads/2015/10/GOPR0079.MP4