Nikon D800's "Swift" performance

The Nikon D800 is a remarkable camera, sporting an astounding 36,8MP sensor capable of delivering extraordinary detail. It is, however, not known for its speed - when this is needed the D4 delivers the goods. It is claimed to share the autofocus sensor of the D4 and I wondered how the autofocus would hold up when shooting fast moving subjects. I tested it on swifts and was not disappointed. Although the frame rate is much slower (4 fps) the autofocus managed to track this fast flying White-rumped Swift Apus caffer with astounding accuracy even when flying towards me. As is often the case frame rate is no substitute for accurate tracking and good panning technique. I find as our equipment gets better we often blame our autofocus systems for soft images, when in fact it is our panning technique which can so easily let us down...

Camera details: Nikon D800 with Nikkor 500mm f4 VRII handheld. Exposed at 1/4000sec at f/5.0, ISO 800