Canon EF 16-35 mm f/2.8L III USM
Taking into account the fact that the first lens of that type was launched already in 1996 and five years later the company showed a model with a bit wider focal range we were surprised that the next version of the lens, marked as II and launched in 2007, was a fail.
solid casing; excellent image quality in the frame centre; very good image quality on the edge of the APS-C sensor; good image quality on the edge of full frame; imperceptible longitudinal chromatic aberration; lack of serious problems with lateral chromatic aberration; moderate spherical...
a bit too high coma for the longer end of focal range; monstrous vignetting on full frame