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Okay, this might be easier if I say what I already have.
I have recently given my partner my Nikon D7200, Nikon 50mm F/1.8D and Samyang 14mm f/2.8.
I have a magnificent Sigma Art 85mm f/1.4 that I am planning on selling very soon as I recently bought a new Tamron 90mm Macro with VR. The Sigma does have a slight edge in sharpness over the Tamron but it is very slight but the Tamron is more versatile as it has very similar FOV abut also allows for macro.
So what I’m looking at is a lens with a tighter FOV than my 90mm that I can use for general photography and astrophotography with my Nikon (non-Canon) and attaches to my QHY163M (QHY have issues with their Canon adapted but my Binon one works perfectly).
I can get a second hand Zeiss 135 F2 for the same price as a Sigma Art 135 F/1.8 but from image comparisons the Zeiss throws up a better image in every day photography.
Optically the Zeiss is a fraction sharper and has less distortion than the Samyang but the Samyang has a fraction better colour correction. Not sure exactly how the Sigma stands between the two of these in colour.
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