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Gheller -- The newest 24-70L II is built really well (see Roger's tear down on the Lens Rental site), and getting outstanding reviews for sharpness and IQ.
The original 24-70 is not as good of engineering as the new, but it was an improvement over the internal mechanisms of the first and second 28-70s.
I've been checking my 24-70L in anticipation of a new 24-70L II test unit arriving next week from CPS. I'll do more comprehensive A-B comparison at that time. But for now, I'm still impressed with the sharpness I get from the 24-70 original at wide open. These shots are wide open on 1D Mark II (so, some 1.3X edge cropping, but otherwise these are full frame except the last one) at ISO 100, 70mm, 70mm, 50mm, and 65mm.