I love the quality of the D3x when I get everything right. Change to 36mp of D800 does not not appeal; I now prefer the solidity and balance of the larger camera body. Action images such as birds in flight, the 10 of my D200 still look good, D300 and D700 better in more challenging conditions, D4 16mp stunning in very challenging conditions. However, one of my favourite images of all is a peaceful winter sunset on 6mp Coolpix, an unplanned shot as a wake wave from a distant ship died on the shore; the camera in the hand when opportunity presents is the only one that counts. All that said, I prefer above all, in the right circumstances, 80mp of the PhaseOne IQ series. Now, I cannot wait to try the Nikon lenses on the new Alpa FPS with the promised Nikon adaptor in front and the IQ180 at the back. Now Nikon, will the D4x match that?