I have two versions of these targets successively on a 7D and a 5D III, the first was already very good the second is according to tests dxo analyze the best lens 24-70 all brands. Results on a 5D III: for 24mm focal length is 28 mmm: the goal close to perfection in sharpness of F / 2.8 angles are slightly worse (score> 4.50 on 5), F / 4 is even better, af / 5.6 excellence it borders to achieve F / 8 af / 11 is always exellent a small loss in the corners (really minimal note> 4.80 of 5) af / 16 is slightly worse has F / 4 and has a little better F / 2.8 . 35 minutes is a bit less good but the notes are still in the exellence with a slight withdrawal F / 2.8 the corners (4.50 of 5), even finding a 50mm (> was 4.10). the performance of the lens is less than 70 mnm good but it is really very good (slightly down on the angles) The other "defects" vignetting and distortion are very contained and easily correctable in post production. for me the results I see no calls to each cliché that I do is clean all over to me the best goal I have, and one I almost permanently on my 5D.
