the one i bought (direct from korea when I was visiting family) was fantastic. You do need to drop it down to maybe f4 but its tack sharp with almost 0 CA. I do hear that the quality control leaves something to be desired but if you do get a decent copy, they're an absolute keeper and you won't find a better lens for the price elsewhere. I reckon they're worth the gamble. Just buy them from a reputable dealer that accept returns OR you can buy second hand and try it out beforehand.
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