It doesn't, you're correct there. The Black Magic 4k has less dynamic range because of the global shutter. If it had the standard rolling shutter it would have 13 stops like the pocket cam and original Black Magic camera. A lot of 4k is marketing hype and gadget lust, but even for those among us who see little use, it still has benefits. It encourages more data throughput and pushes technology forward. In a few years working in HD will be as trivial as working in SD is now. For now I like 4k because it mashes down into a very nice HD image.