Personally, I own the 24-105, the 24-70 and the 70-200 II. If I were to be stuck somewhere with but one lens, I would take my 70-200.However, if there was a lens that combined the 24-105 and the 24-70, with the sharpness of the 70-200, and with max aperture at f/2.8, I would probably keep that on my 5DII most of the time instead. ... /dream