This lens is JUST SICK!! dpReview finally did a full comprehensive test. There are a number of posts here on the forums about it when it announced and then the eventual delay in release as well as the stratospheric price-tag.
http://www.dpreview.com/lensreviews/...0-400mm-4-1p4x
and I must say, this is absolutely the most pornographic photography piece of gear for some time now for our kind of shooting. I am a huge lover of the Nikon 200-400mm f/4 which most of you know I have a copy of. The Canon copy is just that much better with the 1.4x built in extender and STELLAR optics... just simply the cream of the crop. I may not like the price, or the Canon ergonomics, but this lens would make me buy a 1Dx just to shoot this lens wide open at an airshow... wow!!
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