Through serendipity, the focus for this example happens to demonstrate the varying field of sharpness of the 24/1.4L II. The image was taken at f/1.4, and studying it gets curiouser and curiouser (apologies to anyone named Alice).
The reader is advised to download this image and study it in Photoshop (click on it for the full-res version).
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EF 24/1.4L II @ f/1.4