Just uploaded: comprehensive tests with 100% crops and full frame distortion/vignetting evaluations
14mm GROUP TEST:
Sigma 12-24mm v Canon 14mm v Nikon 14mm
WA ZOOM SHOWDOWN:
Canon 16-35mm f2.8 L v Nikon 17-35mm f2.8
Both at: http://www.16-9.net/lens_tests
Thanks, Mark, that was yet again an entertaining read as well as interesting!
I've earlier noted that my friend's sample of the 16-35mm f/2.8L seemed decent enough as to not cause any major complaints in RL use on a 5D (that Asia trip in September-November), and I'm also happy to see that the Nikon performs so well.
In the 14mm group test, that Sigma was a stunner, but I was also surprised to see that the Canon outperformed the Nikon.
Minor, off-topic nit-picks: in the 14mm group test, you have mislabeled the f/5.6 test for the Nikon as a f/2.8, and in the WA zoom showdown, the last mouse-over comparison doesn't seem to work.