I evaluated the GoPro Hero3 Black Edition and found some material deficiencies which were not addressed by your tests. The most severe deficiency is that it uses cropping and line skipping achieve the different video output modes. As a result of the cropping, each video mode, such as 4k vs 1080p, has a different field of view. As a result of the line skipping, the measured resolution of the GoPro footage is low. Even in 4k mode it does not provide even 1k lines of measured resolution. In 1080p mode I'd be surprised if the GoPro provided more than 480 lines of measured resolution. Your tests are flawed because that they do not point up this very obvious deficiency in the GoPro footage. Your write up is flawed because you do not say which modes you used to evaluate the GoPro, which means your tests cannot be reproduced by others. At the very least you should tell us which modes you used and you should report the measured resolution of the footage in those modes.