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While Tamron is busy with the 17-70. Sigma appears to see no other choice than go all-in with FF L-mount. (Since Panasonic can't get their shit together and support L-mount with APS-C body, there were leaked rumors of Sigma being pissed at Panasonic, Sigma has F1,4 APS-V lprime lenses ready for L-mount, but Panasonic has no L-mount APS-C bodies)
Everybody appears to be hyped about their 20-80mm F4 patent.
It's going to be a real innovation that sets them apart from other lens makes.
Whereas Tamron is attempting to revitalize APS-C and make the world's most compact 24-105 F4 equivalent.
It's interesting because they manage to avoid stepping on each other's toes this way.
