Vinz you will find all l glass is sharp that's what you pay the money for, I use my 24-105 in the studio and its super sharp, yesterday I shot a fair bit with my 100l and man that is a sharp lens.
Thing is though most lenses when you get to f8 to f16 are pretty dam sharp and when you make prints I doubt you can tell a great deal od difference.
I agree with this. For my portfolio I printed out an 8x10 I took using my 24-105 at 24mm f/4... and it looks great. Pixel peeping is dangerous... I've only recently begun doing it and have been telling myself to stop doing it so much. More than likely no one will ever zoom in 100% on my full res images... the only things that matter are web viewing and looking good in print.


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