Why no mention of the new 24-70 f/4 IS version that should be available in January? I have the 24-70 vII now and just rented the Tamron for comparison. I didn't care for the Tamron that much and didn't feel their VC comes anywhere close to the Hybrid Canon IS version that is on the 70-200 vII.
Now I am considering returning the f/2.8 and ordering the f/4. Just don't know. I love the IQ with the new 24-70 on the 5DMkIII but scared to death of camera shake on the shot that I need to capture.
Any speculation that the IQ will be less on the f/4?
Speaking specifically of the announced 24-70 f4, it is still unclear to me why a shorter range with the same aperture of f4 would be better than the 24-105 L for an average user. Unless perhaps it is almost exclusively geared to be paired as a kit with 6D.
Perhaps 24-105L being rather ubiquitous makes it less disirable for some? But then, the new 24-70 f4 will be equally so in a few years. I can't speak for individual copy variation that seems to exist among 24-105L, but mine is sharp. Unless the IQ and IS are both updated in the 24-70 f4 to the extent where its reduced weight becomes a key selling point, I think the 24-105L is still the better contender at give away prices.
If the price of the new 24-70 f4 L (now listed at $1499) comes down eventually to $900 then I think it becomes a more interesting match up and will present a tougher decision... lighter, marginally higher IQ and IS of the 24-70 f4, against an older, heavier, bulkier 24-105L. For some, the ergonomics could be an important issue, but not at ~$600 price differential with a shortened range.