Ok I need help to figure out what glass I should buy. They are both the same price but I heard good reviews from the first one Im going to list. The first one is "Zoom Wide Angle-Telephoto EF 24-70mm f/2.8L USM Autofocus Lens". The second glass is the "Zoom Wide Angle-Telephoto EF 24-105mm f/4L IS USM Autofocus Lens". Has anyone ever had any experience with either lens and if so what do you think? Thanks in advance.