From 14mm to 20mm, you won't find a prime sharper than the Nikon 14-24mm f/2.8 (yes, that includes the Zeiss 15, which I'd say is about equal to the 14-24). The Canon TS-E 17L would be sharper, but, unfortunately, cannot be mounted to the D800E even with an adapter, due to Nikon's greater flange distance.
From 21mm and up, of course, you have the Zeiss 21mm Distagon.
The Nikon PC-E lenses don't hold a candle to Canon's TS-E tilt-shifts. Less sharp, less shift and no ability to independently adjust the tilt and shift axes.