Pentax came up top in image quality! But they hated the colour scheme on the lens body.
Pentax DA 12-24mm f4.0 19 (out of 20)
Carl Zeiss T* 16-35mm f2.8 18
Olympus Zuiko 9-18mm f4..0-5.6 17
Sony DT 11-18 f4.5-5.6 17
Canon EF-S 10-22mm f3.5-4.5 17
Nikkor AF-S 12-24mm f4.0 17
Pentax DA 12-24mm f4.0 19 (out of 20)
Carl Zeiss T* 16-35mm f2.8 18
Olympus Zuiko 9-18mm f4..0-5.6 17
Sony DT 11-18 f4.5-5.6 17
Canon EF-S 10-22mm f3.5-4.5 17
Nikkor AF-S 12-24mm f4.0 17