For about a year or so, I've been using and been happy with the 5D III, but I've been very curious about the D800E and two weeks ago, I finally got one.
Since then, I've been doing a lot of personal test to see if I want to convert to Nikon or stay with Canon.
Needless to say, D800E is very impressive.
Test 1 - Shadow recovery (Noise and banding)
Same camera settings.
70mm (Nikon 24-70 and Canon 24-70 II)
Raw file converted to JPEG - No sharpening or noise removal.
LR 4 - Shadows slider to 100 and Blacks slider 100
Here's the original shot.