“Know your gear”. Especially on the D800 / D800E.
To DAP, I’ve added a study showing focus shift with the Nikon AF-S 85mm f/1.4G. The study includes a 1/2 stop aperture series from f/1.4 - f/16.
The Nikon AF-S 85mm f/1.4G has some serious sharpness issues as a practical matter, especially in the f/4 - f/5.6 range. The 85/1.4G is crispy sharp, just in the wrong place (due to focus shift).
Focus shift is discussed in detail in Making Sharp Images.
Image below will display at Retina resolution on Apple MacBook Pro Retina display.
Entire scene (non Retina):