Well, I thought I had almost all the lenses I needed for my gradual switch from film to digital, since I'm not a pro I decided I could get away with non-canon lenses and I ended up with the Tokina 12-24 and the Tamron 28-75. They are both excellent lenses and I have no complaints about their sharpness, focus speed, or build. Then I had to go and get a Canon 70-200mm IS L lens. Immediately after receiving it I took several dozen shots, mainly to test the stabilization feature, when I reviewed the pics I was amazed, the pictures have a lifelike 3D quality that reminds me of my Rolleiflex. While the sharpness is similar to the off-brand lenses, this 70-200 produces better looking pics because of this hard to describe quality, even the most mundane image seems to stand out. My question is this... does the Canon 24-70mm L lens also have this magic? I am content with my Tamron but if this is something shared by both the 70-200 and the 24-70 (or other L lenses) I may have to save up for it. I'm serious with this question, the quality is hard to put into words but I think it could be thought of as a "signature" and I'd like to hear from those who have used both the Tamron and Canon or those who have the Canon L's and can tell no difference (or one) in the pics. Thanks, Bob.