UPDATE: Sigma announced an amazing f/2.0 constant aperture Full Frame zoom lens! It’s a 24-35mm f/2 DG HSM Art Full Frame. But there is a bad news…there will be no A-mount version yet. But as it happened in the past a Sony A-mount and Pentax K-mount version are likely to be announced 6-12 months after the first Canon/Nikon/Sigma mount release.
P.S.: Their 24-105mm FF A-mount lens is still not in Stock yet :(
Images via Digicameinfo.