I bought a D800, keeping my Canon lenses for a while, I bought a 24-70 f2.8G, a 80-200mm f/2.8D, and a older 200-400mm f/4 AIS. I also already had a 50mm f/1.8D and several lesser lenses.
Thats when I discovered that Nikon lens quality was not up to the D800 resolution. The 24-70 had way too much CA, the 80-200mm was just OK.
But, when I went to look for a replacement for my 24-105mmL, my 135mmL, my 70-200mm f/4L, my 100-400mmL, there was nothing worth buying, even at the higher prices.
I was disappointed, a nice body that was excellent at low ISO's (800 was marginal), but the lens selection was poor. I also discovered there were no sraw settings for when I wanted smaller files sizes, I could crop, but I can crop in post.
I sold it after about 1200 images and bought a used 5D MK II while waiting to see how the D1 X turned out.
If it weren't for the lens situation, I would have kept it.