Upload & Sell: On
Renowned UK wildlife photographer Andy Rouse published a full review of the lens - he's been testing it for 6 months. Going by the article & the images he published on his blog, this looks to be the lens to get. Now who's got a spare £12k.
I was at an aircraft photography day last year where he was using it - he went absolutely ballistic, calling me all the names you can imagine, when I posted a couple of anonymous photos of it here - somewhat OTT as there had been plenty of shots of it inuse at the Olympics published by then!!