Not quite sure what you mean by "another party", but I dealt directly with Nikon customer service, met with the techs at the new service center in LA, Wilshire Blvd, and they "adjusted" my D800, so that, at least for now, without extensive re-focus evaluation, things seem fine. I'm kinda tired of shooting test targets to test edge focusing issues and am more concerned with real-life performance. I also gave them my 24-70 to "mate". Both came back within 8 days (UPS next day) apparently fine - as I say, I havn't done more Focal and FocusTune testing, but it seems to me, from field shooting, focus performance is acceptable and wide open, with f/2.8 lenses, I don't see any issues.
One can test to death and find fault with anything - but so far things appear to be better.
When words become unclear, I shall focus with photographs. When images become inadequate, I shall be content with silence. - Ansel Adams