I would like to see 24-105mm f4 OS. The Canon version is a bit date, and still expensive; and eventually it will be discontinued, which would leave us only the very expensive 24-70 f2.8 and the slighlty less expensive 24-70 f4 IS. So a Sigma alternative in this area would be very nice, and also a big hit, if Canon really discontinues the 24-105.
The price of a decent standard zooms is a deal breaker for me to going full frame. First I would have to strech my budget to go with a 6D, and then I have to invest another grand into a standard zoom. So I'm still hoping for a nice 70D (like the 50D, just with a modern sensor and wifi+gps).
? I have seen the Canon 24-105mm online at reputable retailers lately for under $800. I doubt that you can pick up a lens of that quality at a price like that from ANY manufacturer. ..Sigma's Art Line Version (if there was one), would undoubtably cost more....
Is it a perfect lens, no...but at current prices it is a very good value.