I am watching this lens also.
Do you have a lens correction profile for this lens? I have a Zeiss batis 25 lens that at F2 has similar corner stars but they straighten up using a bit of the distortion slider in Lightroom. Can you try that and see if it straightens them up?
Those F1.8 corner stars look bad when pixel peeping but when viewing the overall image they aren't bad.
It seems good not great and for $2000 I kind of expect more considering there are some good choices for well under $1000. The Samyang 12mm F2 for APSc cameras is fairly good at F2 for example.
Greg.
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