Sorry to disagree, but I can tell the difference between my Tokina 11-16mm f2.8 and my new Nikon 14-24mm. KR raves about the Tokina so I bought one for my D300. It worked fine on the D300, but I get some strange banding in horizon colors with and without a polarizer when shooting with it on my D800.
Hey, that is what NAS is all about. The D800 is just the razor, the blades are where Nikon makes money.