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Great lens (with a couple of caveats).
Samyang/Rokinon quality control is known for being patchy. I think it might be getting better these days but buy from a vendor that will allow for easy return if you get an example that's a bit soft.
I've had some issues with halo-ing around bright stars - not CA but internal reflections between lens elements. This may be resolved or partially resolved in later revisions of the lens (I've had mine since 2017) or perhaps different camera setups are affected more or less.
Focus is critical (as with all fast optical systems) but the lens is so sharp that even a slight misfocus will have big implications for the quality of the image.
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