I'm not seeing a material difference using the D800E and normal shutter speeds. Yes - if you miss focus, have inadequate DOF, or have motion the images will be soft. But I don't really agree that it requires special technique or settings. I think it is also a matter of looking at a more highly magnified image - as Alex and others suggest. I'm finding the D800E far sharper than than any other camera. It is much easier to get a sharp image than with a D7000 for example.
One other factor to keep in mind. When you have lots of detail, it is easy to have detail beyond the capability of your monitor. I find that zooming in to 50% usually reveals sharp detail that may be obscured at normal viewing. The same can be true with prints.