This page compares the EF 17-40/4L to the 16-35/2.8L II at 21mm, using the Zeiss ZE 21mm f/2.8 Distagon as a reference. All conclusions are based on viewing all the images as 16-bit TIF in Photoshop, processed from RAW.
The 17-40mm f/4L was a brand-new lens, supplied for testing by our trusted vendor B&H Photo.
The 16-35mm f/2.8L II was my own existing lens, one I know to represent about as good as one can expect, based on multiple prior samples of the original 16-35mm f/2.8L.
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