35GM breathes like a dragon. There is a reason why it is cheap in the used market. And it's vignetting is not better than RF35L.
As for Samyang.... I guess size doesn't matter for you right? If so, Sigma 28Art and 40Art are much better than Sammy.
Those numerical score doesn't reflect in a meaningful way if you are comparing across the different systems.
The 35/1.4GM is an excellent lens. Yes, there are focus breathing issues which are managed with focus breathing compensation in many of Sony's newer bodies. Lens design is always a trade-off between different factors, and unless you wish to make your lenses absolutely massive (see: Nikon), something will take a hit. Canon has chosen digital compensation for other issues instead, and has better managed focus breathing.
I look forward to Sigma releasing mirrorless-native and more compact DG DN versions of their superb 28/1.4 and 40/1.4 lenses. Unfortunately I doubt Canon will ever allow them to be sold on RF mount.
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