For those of you wanting to see the high ISO performance see this shot by Photo John
http://gallery.photographyreview.com/showphoto.php?photo=80145&what=allfields&crproducts=385769:Canon%20EOS-1D%20Mark%20III|&mcats=518
And check out his Yellowstone thread in viewfinder that has links to more info and shots at various ISO's
It really IS as good as they say!
JS
Canon 1D
Canon 1D MK II N
Canon 70-200mm USM IS f2.8
Canon 200mm f1.8 USM
Canon 300mm f2.8 USM IS
Canon 28-300mm USM IS f3.5-5.6
Canon 50mm f1.8
Vivitar 19-35mm f3.5-5.6