Bottom right corner
The 14-24 offers the least blurred image at avery aperture, offering a crisp image at f/8 and f/11.
The 16-35 needs f/8 - f/11 to clean up, yet is not quite as sharp as the 14-24.
The 17-35 is very blurred at f/2.8, improving steadily to f/11 - f/16, where it offers fairly good sharpness.
The 20/3.5 improves steadily through f/11, then improves just a bit to f/16.
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