Great news from Sigma! Finally APS-C users have a tool that is (on paper at least) not only equal, but BETTER than any FF lens available offering the same FOV. While we'll have to wait and see how the lens performs, it is an incredible engineering achievement on one end, and a very welcome creative tool in the bag on the other end...
Following the new announcement, I posted an article on my blog with my reflections on the lens and what it means to APS-C and full-frame users.
See THE ARTICLE HERE.
Hope you'll find it interesting, best
I'm happy with - in fact far prefer - primes. Provided Sigma keep delivering class leading performance with full-frame primes in their Art series, I will keep buying them.
I think they might be doing what Nikon did with the 14-24: that lens is better than any prime in the 14-24 range, excluding the 24 f1.4 which is in a different class (f1.4).
Probably manufacturers think that there isn't enough market to invest R&D in ultra-wide primes when they can provide "good enough" quality for the majority of users with zooms, compacting R&D costs and maximizing profits. The WA and U-WA primes market seems to be (and probably will keep being) monopoly of third-party manufacturer (Zeiss first, Sigma, of course Voigtlander & Leica in M mount but we are talking SLR here, etc).
Here's the pudding, wherein the proof is supposed to be. I have no experience with the camera used, a Canon 600D, but the results seem very nice, although not ultrasharp out of the camera at f/1.8 (see the crops of the child portraits at the bottom).
Gear for Image :: Sigma ART 18-35mm f1.8 DC Preview
However, so far so good, as they say