After the purchase, I immediately tested it with tables, and came to the conclusion: 1) it does not wash the edges of the frame, but they are simply darker (i. E. vignetting), which degrades the quality of the image at the edges in jpeg. 2) I confirm that the lens aperture 50/1.4 F4 is equal to aperture 24-105/4 F4.5, i. E. he is darker. In general, the lens is good, high-quality pictures in the daytime, my copy is sharp at F4 and with a decrease in aperture, the quality improves only at the edges. I use with 5DII.
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