Well, we knew a few of these were inevitable when the Cine versions were announced, but hey. There is one more I got a heads-up on a few months ago, nice to see it being received well.
Thank all the powers that be that there will finally be a pro-grade 28mm option for a Canon mount. This has been my most-requested lens from Canon for the last decade. It pisses me off no end that they patented a 28mm f/1.4L design to match the 24 and 35, but never bothered to make it; meanwhile they still pump out the early-90s 28mm f/1.8 which falls to pieces on any modern body. With this and the fast 105mm, Sigma are nicely filling in all the blanks I want from Canon. I could sincerely use nothing but Sigma lenses now, both for all my work and for all my personal shooting. (I won't, 'cause the focusing is still dodgy with some models and I've got perfectly good Canon lenses which don't need to be replaced, but Sigma do now cover every focal length I use.) Shame the filter thread is so large though, so it's a safe bet the lens will be on the unnecessarily heavy side.
The 40mm should be nice, never been terribly happy with the Sigma 35mm or 50mm so sure, I'll take that. May as well. Again, shame about the size, though.
60-600 is a nice surprise. I don't anticipate it having the best optics or AF, but I can see it being very useful for keen starter sports photographers who don't have the money for 'big whites' and for whom total IQ isn't as big a deal as either full-time professional sports shooters or wildlife pros, who'd go for the 150-600 instead. (Which presumably will still have better IQ and AF.)
The 70-200, eh. Sigma's 70-200s have never been terribly impressive so it's hard to be interested in this one. If it has the newer Sigma's AF performance and the price is low, though, it sure has a good market.
The 56mm is a lens I got to see a while back but couldn't discuss publicly. Clued-in due to my well-known love for the 7D series. Anyhoo, in the short time I got to peek at it, it seemed like a monster. Better-built than Sigma's other 'contemporary' lenses that I've handled; couldn't do any detailed image testing, of course, and it was a genuine pre-production (not what manufacturers' PR call "pre-production" a month before a camera is on store shelves; actual pre-production, as far as they hadn't even decided if it would be in the 'contemporary' or 'art' series at the time) so the AF didn't seem all that hot, but hey. I hated the Fujifilm 56mm f/1.2 (three copies of it), but the Sigma feels much better in the hand, the focus ring especially is a lot nicer, and though I can't speak to the image quality in terms of any kind of detail, on the back of the camera it seemed really nice; no distortion or vignetting.
I never got a word about the price or when to expect it to market. It's nice to see it is evidently very close to release; I wasn't expecting it until late next year. (Hence uncharacteristically being willing to keep quiet about it.) If the price is kept reasonable—and since it's a 'contemporary', it should be—it's going to be a monster for APS-C systems and the new standard, most-common portrait prime.
The 28mm is the lens which means the most to me, but FWIW I do believe the 56mm, thought he most unassuming lens of the bunch, is going to be the one making the biggest splash and the most difference.