The Slovenian website e-fotografija have published a very interesting comparative review of 4 different 70-200mm telephoto lenses, with Sigma, Canon, Tokina and Nikon all represented. As usual with e-fotografija’s reviews, there are a large number of sample images from all 4 lenses.

Website: e-fotografija - 70 - 200mm f/2.8 Lens Review

Website: Slovenian Translator