Responding to the Sigma post below...

[wowzer]

I wasn't sure if it was a typo, but it appears not (if rumors are true). The new Sigma 24-70 OS is f2.0 and not 2.8! That would be an interesting full frame lens...

http://www.canonrumors.com/2013/07/sigma...oming-cr1/

[Racer X]

phew, I thought this was a 6 Sigma post.