Field illumination (vignetting, etc) is compared over a wide aperture range by clicking the image below.
I don’t necessarily consider low vignetting a plus, because vignetting has lovely expressive potential. But if one wants minimal vignetting in the f/1.4 - f/2.8 range, the 50/1.2L is the clear choice, and it still offers a pleasingly useful amount of vignetting at f/1.2 - f/1.8.
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