Canon 24-70 mm f2.8 L vs Canon 24-105 mm f4 L IS

There is probably no more frequently asked question on photography forums than what is the better lens when comparing Canon's two professional mid-range zooms. These discussions are invariably circular and pretty much get nowhere, like an old married couple arguing: "he said..." "she said..." "he said..." etc, ad infinitum. Typically they end up confirming what we already know at the start: the Canon 24-70 f2.8 L is one stop faster and somewhat bigger; the Canon 24-105 f4 L has image stabilization (IS) built into the lens and has more reach on the long end. They are both built like tanks. They both cost a similar amount (maybe not an arm and a leg when you consider their quality, but the equivalent of a hand and a few toes anyway). One's tempted to say, "You pays ya money and you makes ya choice."

But what choice should you make?

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