Its pretty obvious the 24-70 version TWO is a sharper lens than the 24-105. How ever how does the 24-105 compare to the old 24-70 version ONE. For reference from another view... the link below shows a test of the V1 vs v2. The worst v2 tested was still better than the best v1. I would like to see some kind of upgrade if I decide to sell the 24-105.
My situation is as follows:
I like to use my 24-105 as my walk around lens. It does the job very well. So the lens in question will be my general go to lens when on vacation, visit new places or want to travel light. Keep in mind the version ONE can be had for around $1000 vs the version TWO at $1700 both lightly used.
I plan to add a 16-35 to my collection and upgrading my 70-200 f4 IS to a 70-200 2.8 IS with a x1.4. I also have a 50mm 1.4 which I may swap out for a 1.2 however this is all depent on which lens I decide on.
I am not a professional, just an enthusiast who enjoys all types of shooting.