One of the ways this question might be answered is when someone opts to have their regular D800 AA filter removed, by one of the companies that perform this modification regulary on DSLR's and of course have the opportunity to compare this modified D800 to the native D800E. I'm sure down the road, there might be some who will have the AA filter removed from their D800.
I may be wrong, but if I was to take a guess now, I would say aftermarket removal of the D800 AA filter will result in a bit of increase in sharpness over the native D800E (and thus a noticable increase increase in sharpness over the D800)....and that the way Nikon implemented AA filter removal in the D800E was done in such a way as to sacrifice a bit of additional sharpness and yet somehow as a consequence of this modified way of removing the AA filter, also reduced the occurance of moire' to a degree over other methods of AA removal. The part about reducing some of the occurance of moire' in their D800E AA filterless camera is an assumption but I know Nikon would be sensitive about marketing a camera where it's occurance would have been seen quite frequently (for obvious reasons). Then again consistancy in assembly of both cameras (D800 & D800E) probably also played a role. So in other words they somehow developed a conservative approach to what is essentually AA filter removal with some possible +/-tradeoffs, as I just surmised.