I currently have a a 28-135mm kit lens that came with my 7D. Looking into expanding with better L series glass and was thinking... Get 24-70 f/2.8 then 70-200 f/2.8, ...eventualy macro and prime. Searching the other day I found that I may be able to get 24-105 f/4 used at a good price local. Seams to me that it would be better as a general use lens cause of the zoom range but not as good as the faster f/2.8 glass. I haven't compared the usage difference with either lens and was hoping to get some input in experiences others may have. What are your thoughts on the 24-105 as opposed to the other f/2.8 set ? Any comment would be appreciated.