17mm Comparison: f16

Canon 16-35mm f16	Nikon 17-35mm f16

Here seen resisting diffraction effects better than the Canon L, the Nikon 17-35mm AFS is pulling just a fraction more information from the scene. Needless to say, by this aperture the difference between them is negligible.

Canon 16-35mm f16 (corner)	Nikon 17-35mm f16 (corner)

Up in the branches in the extreme corner, we see purple fringing from the Canon and blue from the Nikon, even at f16. For resolution there's little to choose, though once again the Nikon perhaps just shades it.

Next up, the same lenses at 21mm . . .