To be honest, for me personally, the color rendition is very important. I still see a big difference in the color rendition of the "L" lenses. I've seen it in images here with the 24-105 - and I certainly see it with my 17-40. That's one reason I got it - and haven't regretted it. 
Not to mention that I need the IS. getting to be that age, you know.
Maria
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http://mariaimage.smugmug.com/
Not to mention that I need the IS. getting to be that age, you know.
Maria
--
http://mariaimage.smugmug.com/