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I hope you don't count me among those people The Sigma is very well matched, lens to sensor. This is harder with the D800 (but possible). A full-colour 14MP image is also not going to match a 36MP one-third-colour image for resolution, but it does come close, and beats it in colour resolution, of course. My concern is more that I think a very light AA-filter would have helped the results. I never thought I would say something like that, but the extreme sharpness leads to some pretty extreme sampling artifacts on occasion.
Ha ha! Yes, part of that extreme sharpness look from the Sigma is simply over processing. The other culprit is an enhanced contrast effect, particularly in the darker tones. It really is a camera which one must nail exposure. When you nail it, the results can look phenomenal imo. It has it's warts and issues just like any other camera - maybe moreso in some respects.
The D800/E is very picky with lenses as we know. Of course, you know my biggest gripe with that camera is the Live View. For my studio/ commercial work, I really need Nikon to add an "effects" on/off type option when using Live View so one can have it either reflect ones exact settings (as it does now) OR have it automatically give one an auto adjusted preview regardless of settings (which is what is needed when using Live View + Strobes in a darker environment and one has the exp. set at say 1/250 sec. @ F8). As it is now, one has to fight the camera to make things work under that situation (and that's not even taking into the frustration of dealing with the line skipping LV preview). It's really an odd oversight given the camera is likely used by a lot of commercial/ studio photographers. I really hope at least the first issue is fixed in a firmware update (I had to get rid of the D800E for this reason but if it gets fixed, I will buy another one asap!).