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I have the 17-40L and 70-200L which are both F4. Like you I was a little concerned about them not being faster lenses but for the most part I have never had any problems and believe I have never missed a shot due to that. With the 24-105 having IS that is good for about 2 stops anyway (for most people) and with the range of the lens being ideal as a walkaround I would doubt that you would get any problems.
From all accounts the “fixed” lenses are returning stunning results.
How much lighter is it than the 24-70 though as you say that is very heavy?
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