I'm not sure if your assessment is correct. Remember the GoPro 4 has a very Wide angle lens while the P3 would be the equivalent to a medium setting on a GoPro 4.That might be the worst comparison video I have ever seen. Both cameras are not at the same place at the same time. If I had to pick it would be the P3 because it looks brighter.
I wouldn't get too excited. Look at the video again. Different angles different lighting. P3 looks a lot brighter but still different lighting. Why not compare in actual daylight? Also how do you compare in a one minute video? You can't!I'm not sure if your assessment is correct. Remember the GoPro 4 has a very Wide angle lens while the P3 would be the equivalent to a medium setting on a GoPro 4.