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).
You are 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