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I looked for the non-Canon version, and was unable to find it! Seems in this area, Canon reigns as "Alt-iest".
I challenge anyone to find an Alt-ier UWA lens in functionality and performance (in DSLR, see below) than this.
Although, I have to say that thrice is in the same ballpark (JK!). As they say in Australia, "THIS is a knife!" Nice work, thrice! Is the waterfall shot in Australia, or the Pacific Northwest?