Mr. Cox doesn't need me to defend him, and I'm not, but he does admit, "Of the twelve lenses below, I have personally used all but three – the Sigma 14-24mm f/2.8, Tokina 16-28mm f/2.8, and Nikon 18-35mm f/3.5-4.5 G. Nasim has used both the Tokina and the Nikon, which makes the Sigma 14-24mm f/2.8 the only lens on this list that we are relying on outside sources in order to rank."
The way I read it, he has a lot of nice things to say about all 12, and I sort of see it as a "pick the one that best suits your needs, they are all good" sort of article.