I think the GSO plossls I have are quite good. They're not crisp right to the edge, but I didn't expect them to be. They have quite good contrast and are nice and sharp on-axis with good eyerelief, no kidney beaning etc.
Having said that, I haven't done any side by side comparisons with other (good or bad) plossls so take my opinion as you will.
Maybe someone else has some medium + good quality plossls of the same focal length and can do a review/shootout for the reviews section of the site?
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