If I understood well, in D800E there is not an AA-filter. So you don't need capture sharpening unless the raw converter introduce blur.
There are several sources of blur, and the Bayer CFA demosaicing process is not the main source. It already starts with the optics, and aperture we use, and that is assuming that we don't introduce motion blur or defocus blur ourselves.
Then there is the use of an AA-filter (or not) and the Bayer CFA undersampling of mostly chromatic information, and the fact that the sensors are not point samplers but have an area aperture. Finally there is the demosaicing process that cannot reconstruct luminance resolution perfectly, although some 93.6% isn't all that bad.
The problem of D800E may be aliasing artifacts.
That doesn't mean that cameras with an AA-filter do not show some aliasing artifacts, it's just that they have a lower risk. The effect of an AA-filter on resolution can be very small (approx. 1% in the case of the D800 vs the D800E). The D800E is
more likely to create false color artifacts and stairstepped edges (jaggies) at wider apertures though.