This is a quick review comparing Nikon D810 and Phase One on a hasselblad V mount.
The Phase One has the largest single capture ccd in the market at 40mmX54mm, similar to the Leaf Credo 80Mp. From my understanding, after speaking directly with Leaf representatives in Israel, the resolution and dynamic range of both backs are rather similar. I believe that this comparison is valid to comparing a Nikon D810 and a Leaf Credo 80Mp as well.
Nikon D810 36Mp Nikon AF-S 50mm f1.4 at f7.1 1/125 at ISO 50
Hasselblad 500c/m Zeiss 80mm f2.8 at f5.6+1/2stop 1/125 Phase One IQ180
Both on Gitzo Tripod, mirror lockup (Hassy on cable release, Nikon with delayed shutter release).
Despite slight chromatic aberration, the Zeiss lens is superior to the (mediocre) Nikon standard prime, but the make an almost identical angle of view on the horizontal axis.
Images were lightly balance for color and broghtness using Capture One Pro 9 and than downsized/cropped using Photoshop.
See for yourselves: