marike6: What did we learn? That the 24-70 Nikkor is still the best standard zoom money can buy, the D800E the highest resolving camera DSLR in existence, and that the Tamron 24-70 VC, especially on the D800, is a great value.
What we learned was nothing more than two things:#1) At 50mm on optical bench testing, the Canon 24-70 is superior#2) The combination of body + lens greatly influences the overall sharpness
What is left unanswered are how the lenses in question compete at the various distance ranges (since lens performance often varies by focus distance), at focal lengths other than 50mm, and of course a variety of other parameters.
What should also be thought about more is at what point is sharp enough, sharp enough. If you peruse the Zeiss MTF white paper (google it), you'll see that even the slighest miss on your focus results in a pretty drastic MTF drop. Point being, how many photographers actually nail, 100%, focus, on a top tier tripod, in light with no atmospheric issues, where on a large print you could tell the difference between the 1st and 2nd best lens mounted on equal resolution cameras? IMO subjective quality differences will be seen more than a slight MTF 'win' in my experience.