It took me a month to get really good focus and sharpness from my D800. I did a lot of tweaking, sped up the shutter release, and worked on my hand holding technique.
For the price of a D800, I have a hard time thinking the Sony is worth it. What are the extra qualities you get from the A99 with same sensor size as D600? I see none in the specs except a swivel LCD. We do not need more than 5 fps. How good is the ISO at 12,800? How good is the Video, especially @ 1920 x 1080: 60 fps. Does it do "clean" HDMI out?