This topic has been discussed plenty of times.
If you search the archives you'll find a topic about it.
If not check out Fred Miranda.com. There is loads of stuff there.
This lens is ownly used by large magazines now. I think only one or wo individuals own this lens.
Canon have only made 22 examples, 14 of which have been sold. 2 to sports ilustrated, 2 to national geographic, the rest have gone to news agencies while 2 have gone to private individuals. 8 of the lenses remain with canon for use by them, or lending to their "valued" customers. Ie. people with £50,000-£100,000 a year spend with them.
There are numnerous picstures floting around of people using them, although not too many from the actual lens. Search the places mentioned above, or use google!
5D2/7D/1D2(soon to be a 1Dx) 17-40L/24-105L/70-200F2.8L/100-400L/24F1.4LII/50F1.2L/85F1.2LII