I shot with a D800E owner on Saturday morning. Blew him away. His buffer was constantly locked up while I shot away with my 5D MkIII. If you take one shot per hour, then get a Large Format camera made out of wood and steel and shoot film for the best IQ. Otherwise, forget about pixel count and look at actual images.
Here's just one of the shots that my friend missed, as he stood right next to me and cursed his buffer:
Sub-adult by
dcstep, on Flickr