David,
Nice lens indeed! And Andy Rouse did a good job critiquing it. Bu the majority of these lenses will be sold to photojournalists working for the major papers and magazines with BUDGETS!!! Probably 80-90% and the balance to "hobbyists" that just have to have the next best thing!
Very few people here "need" this lens and like Nick, already have the gear they need and will make do with that. $12 Grand for a lens, is truly a luxury item for 99% of photographers,
Rich
Now if I could only get adopted by some really old, sick guy,with $$$$$........