24-70 f/2.8L or 24-105 f/4 L IS?

The way I see it is that, buying L series lenses is a lifetime investment. You pay extra, but don't have to upgrade.
 
The image and build quality on L series is worth the extra money in my opinion, excellent lenses, i'm never going to buy a Canon lens that doesn't have a red ring around it again :D

You shouldn't rule out all non-L Canon glass. Some examples of amazing Canon non-L glass are EF-S 10-22, EF-S 17-55 f/2.8 IS, 85mm f/1.8, 100mm f/2, 100mm f/2.8 macro, Canon has some non-L glass which outperforms other L lenses - but, generally, the L glass should do what it says on the tin.
 
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