Summary: It seems Canon may be attempting to distinguish themselves from the competition by pricing their lens at a premium. There is no doubt that this lens delivers excellent optical performance in pretty much every way, but not many photographers, professional, or otherwise will be able to justify paying...
Pros: Very good build quality, Excellent sharpness, Relatively lightweight, Low CA, Low distortion
Cons: Reassuringly expensive, Falloff at 24mm is quite pronounced at fast apertures and doesn't even fade out until f/8
Canon EF 24-70mm f/2.8 USM L II - Full Format Review / Test Report
22 September 2012
Conclusion: Fast standard zoom lenses are obviously very difficult to design. To date we never really thought "oh, this is it!". Unfortunately this also applies to the mighty Canon EF 24-70mm f/2.8 USM L II. Now this may sound worse than it really is.