Nikon D810 Lab test results
As you’d expect, the D810 romps away to win the resolution battle hands down, right through its sensitivity range. Colour rendition is extremely similar to that of the D7200 and D750, and is similarly consistent when using auto white balance. High-ISO image noise is similar to that of the D5500 and D7200, but with greater retention of detail. It’s a close match to the D610 and D750 throughout most of the sensitivity range, but drops off a little at very high ISOs.
As borne out in real world testing, lab scores reveal that the D810 is unbeatable for resolution, but that high-ISO image noise is more noticeable than from the other full-frame cameras.