This is like the holy grail of lenses and I've used so many high-end ones from every top manufacturer. People often compare this lens to the 300/2.8 but the two are very different. The 200/2 is a versatile lens with the fast aperture and wider field of view.
You haven't seen a lens until you've used this one; Nothing more can be said: http://www.flickr.com/photos/genotypewriter/5080867269/ As you can see, I get much sharper images than the lenstip guys; 1Ds3 has an overly strong AA filter compared to the 5D2 as well
Nothing..; well the white lenses are prone to paint peeling off easily when you knock them about..; especially on the lens foot but can be taken care of; Again, nothing specific to this lens