<p>You can expect a bit of a difference in IQ from the D800 (notso much from the D800e) to the D810 (mainly with regard to overall sharpness), but not so much/as much between the D800e and D810. But it is small and if images are shot in RAW and properly processed, there might not be any real differences after post processing.</p>
<p>With regard to all other attributes, I think it would be difficult to see any differences after post processing identical RAW files.</p>