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...but it seems to be a compendium of internet complaints. If you look at the long list of AF 'problems' cited for the Canon EF 35/1.4L, then you'd think it's a dog. I have one, and it's one of the best lenses around, it even has decent AF in low light (of course, the camera is more important, here)....
Yes, most Samyang lenses have a quite good bokeh like other aspherical lenses, but there are some few with not normal onion rings, but a very irritating wooly bokeh.
It seems like you find such only on Samyang lenses and on the one Tamron zoom I mentioned.
The not correct focus alingment is very special for Samyang lenses too - never heard about such on other lens brands.
Schneideritis is more likely on Schneider older largeformat lenses than on Rodenstock lenses. But older Rodenstock Rodagon lenses seem to be prone to delamination.
There are typical defects, or typical problems. Not every single lens will have these, probably only 5% of the lenses of one type - but this would be significant more than the 0.001% other lenses have this defect.