I have been shooting with this glass for a long time. In the photographer's case, such a lens, as they say, is a "must have", like the 70-200. 16-35 so far the cantor can’t afford me, but I don’t think that it will be useful to me, he still fills up a little coal, but I can’t do this). So, I feel that we are from 17-40 forever.)) Different pros: FAST!) This is the fastest lens I have ever used. The angle is clearly good. Constant luminosity. Virtually no distortion at the wide end. Well, in general, Elka is also Elka in Africa !)) Its cons: Well, of course, it would be better to have a larger aperture, but 2.8 is a different lens))