So went up to Seattle for the weekend, and rented the 24-105L. What a great lens. I currently have a Sigma 10-20mm and a 55-250IS. I, for some reason, have only had an UWA for landscapes. After using the 24-105L, i found that even on a crop sensor, it is wide enough for almost all of my needs. Long end, that is a different story. So i think i am going to sell my lenses to help fund this great lens. I still may decide to get the 24-70L, however. A person could loose their hair deciding what lens (if only buying one lens) they want.