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100% agree with you JA which is what makes it all so confusing haha
This is where hands on experience comes into it. It's one of those times where you can just get lost in MTF charts and various graphs where theoretical and numerical hairs and split without taking into consideration how a lens performs in the real life and outside of a lab controlled setting.
From some further reading this appears to be where the Sigma Art 135 falls into place. DXO and Lenstip have both rated it as being the sharpest lens ever tested and lenstip says that its colour correction is beyond reproach (better than the Zeiss and Samyang) but when shot below F/2.8 it shows purple discolouration in out of focus and high contrast areas (also shown on Lenstip). This isn't present in either the Zeiss or the Samyang.
The general consensus that I seem to be finding online is that if I was to be going purely AP then the Samyang would be the better choice due to a slightly better longitudinal CA correction but as a general purpose lens the vastly superior mechanics of the Zeiss make it the better choice.
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