I don't have the gear to watch real 4k video properly, but watching the first video ( http://www.youtube.com/watch?v=N0m1XmvBey8&feature=PlayL... ), I wouldn't consider it 'real' 4k. I bumped the res to 'original' and saw highly visible encoding artifacts on a 1080p monitor. Artifacts that I absolutely would not expect to see on 4k source RED footage, never mind 2k. It's a nice marketing number, but like buying a camera by megapixels and ignoring lens quality, it's not truly indicative of quality.
