[Luny Tune]

Look at these MTF charts. It looks quite promising for the new Samyang 45/1.8, I think.

Samyang 45/1.8:
http://allphotolenses.com/lenses/item/c_...rettyPhoto

Sony FE 50/1.8:
http://allphotolenses.com/lenses/item/c_...rettyPhoto
(Be careful to read this one right. The think red line is not for the lens wide open, but for F8. In this chart only the green lines are for the lens wide open. I missed that at first.)

Canon EF 50/1.8 STM:
http://allphotolenses.com/lenses/item/c_...rettyPhoto

Sony Zeiss FE 55/1.8:
http://allphotolenses.com/lenses/item/c_...rettyPhoto
(Note here the difference in Lines/mm)

MTF charts are probably the most reliable way to describe the actual performance of a lens with data.

I am only just these days beginning to understand MTF charts. Am I way off in comparing the Samyang more to the Sony Zeiss, and the Sony FE more to the Canon?