I ordered a Nikon D800 from a local Dealer this morning. I have a ton of Canon Cameras and Gear, so I'll be replacing some lenses with Nikkor, but keeping my favorite ones to use with my 7D. I had sold my 5D MK II to finance something new, and tried a 5D MK III. Its a great camera, but I din't use most of the new features and returned it. I'm going to try landscape photography with the new Nikkor 14-24mm lens I ordered with it. My 7D will still be for product photoraphy and focal length limited use, and, of course, I could not part with my 35mmL, 100mmL, 135mmL or 100-400mmL. My other lenses, flash, TC's, etc will go on the block.
Well, the D800 idea went bust.
It was a nice camera, and to start I bought some decent glass, 24-70mm f/2.8G, 80-200mm f/2.8D, 50mm f/1.8D, 200-400mm f/4 AIS.
The camera was excellent, and the DR at low ISO was amazing. However, when I went to print a large image from the 24-70mm, I found a lot of CA near the edges, so much that it could not all be removed in post. It was ugly. Naturally, I assumed a defective lens, but checked the reviews and found others commenting about the very high CA. I also found the AF had more accuracy variation than my Canon lenses, and it was neigh impossible to get the sharpest possible images unless I was in bright light at extreme shutter speeds, or on a tripod. Since I do low light photography, a super high shutter speed is not possible.
So, I sold the lenses, and the body went to a new owner yesterday. I think that someone who uses it in a studio or is very deliberate and has good light will love the camera, but for low light usage, its no better than my 1D MK IV and maybe no better than my 5D MK II. I also found that time to post process the huge images was excessive. Sure, I could downsize them to 21mp or 16 mp, but then I end up with a 5D MK III equivalent and still am unhappy with lens performance.
I ordered a refurb 5D MK II thru the Canon CLP program yesterday for $1400 and I'll wait and see what the trusted reviews say about the 1D X before I buy another new body. I used my 5D MK II for 4 years before selling it to buy a new one, and its a great camera, particularly at the $1400 price.