Personally, I'm not obsessed over MTFs, much less even think of comparing them across manufacturers. I much rather see images do the talking and even then, sample variation can mislead opinions.
ultimately this is a great lens choice for the Nikon shooter as it was one of the big problem lenses in their lineup because it lacked an USM motor. That seems resolved and from the specs, and use of superior glass, it should address every knock against the predecessor.
I really can't wait to see what it can do on today's high resolution world standard: D800/e.
The tripod mount of this lens looks pretty flimsy for a 1.6kg (3.5lb) lens.
That's one thing you can guarantee with Nikon - flimsy mounts on their long lenses.
They may have clever optical engineers but it surely would not cost a lot to get a structural engineer with finite element software to check out the stiffness and vibration characteristics before they go for production.
I'll let the field determine how good it is, but looks like it can be removed and replaced with a 3rd party mount so that is definitively a plus compared to fixed collars.