The Canon 24-70mm F2.8 has an average review score of 87%

Score (%):
Canon EF 24-70mm f.2.8L USM review
What Digital Camera Canon EF 24-70mm f.2.8L USM lens review...
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92

Canon EF 24-70mm f/2.8L USM (Tested)
Multiple user reviews on slrgear.com
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96

Canon EF 24-70mm f/2.8 USM L - Review / Test Report
The full in-depth review from photozone.de
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73