I bought both through NPS, the D4 and the D800E, The D4 just sat around collecting dust, so I just sold it. No Camera I have ever shot with ( Going as far back as the Kodak instamatic, Minolta 101, Canon F1 through various 2-1/4's ) comes close to what the D800E does with images.
The D800E is not as fast as the D4, BUT the D4 can not come close to the resolution of the D800E.
I firmly believe Nikon screwed up with pricing the D800E as low as they did. I think this camera could've been at 5K and the D4 at 6K