Well, $150 is a lot if thrown away for something that does not perform... And it seems the quality of nifty-fifty recently varies a lot. Perhaps an older version (second hand?) is a better option.
I can only say that my Canon FD 50mm F1.4 SSC works very well both in centre and in corners (a way better that any standard lens that comes with Canon body), but it needed mechanical mod to fit onto EOS.
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