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Field of view difference from Canon 17-40mm
Edge sharpness 100% crop comparisons
Corner sharpness 100% crop comparisons
Center sharpness 100% crop comparisons
Place the cursor over the picture to compare the Canon 17-40mm f/4L field of view at 17mm
Below are 100% crops at or near the edge of the test photos:
Near the top of the image (but not at the extreme edge) Canon 17-40mm Left, Tokina on right

Extreme left edge of photo - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

Extreme bottom edge of photo - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

Extreme right edge of photo - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

100% crops of the corners (taken at f/16 for both lenses) - Canon 17-40mm at 17mm and Tokina 11-16mm at 16mm.
Extreme upper right of photo - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

Close to the upper left of photo - down a little from the extreme corner - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

Extreme lower left of photo - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

Extreme lower right of photo - Canon 17-40mm f/4L on left, Tokina 11-16mm f/2.8 on right

100% crop near the center of the photo - Canon 17-40 on left, Tokina 11-16 on the right
