All 4 cameras running at the same time on an evening street scene. GoPro in 1080p mode, Canon 7D 50mm, iPhone 4, and iPhone 4S. In good light I suspect the iPhone 4 would have done better. The GoPro is also really struggling in the low light. The iPhone 4S is close to the quality of the 7D in video mode, but no cigar.
Photo of how this was shot: flickr.com/photos/genen/6252024865/