Here's another one.
http://nofilmschool.com/2012/04/markii-vs-markiii-vs-d800-candlelight/
They say, although the 5dIII has better performance in low light(video), the files the d800 produce have more flexibility via It's 8 bit 4:2:2 format.
Also that the d800 is significantly brighter at low iso and still brighter at higher iso levels.
"The D800 is a camera that should be left at 640-1000 (which is comparable to 1250 and 2000 on Canon) for the most part and lighting used to compensate.
My impression is that for studio work and landscape with detail rich scenes the D800 with the few more pixels and substantial 2 stops of dynamic range is a good choice. couple that with the 14-24 nikon G Zoom lens, there's an unbeatable combination.
For poor light conditions, the Canon focus seems to do especially well but the D800 has an advantage in the dark of being able to use a focus assist beam. The 5DIII gets that with addition of any of the Canon flashes.
If one is shooting video, one can't easily mix the two cameras as the colors are different. The Canon seems to give a redder richer appearance. What surprises me is that both the Nikon and the Canon individual video frames are very poor quality compared to the stills obtained from downsizing a still image to the size of the video frame.
I wonder how the frames compare to video from a video camera like the new
BlackMagic camera using Eos lenses for under $3000?
Asher