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?