Jannik Peters just published a comprehensive review of the new Sony FE 135mm 1.8 Gmaster @ Review: Sony FE 135mm F1.8 GM - phillipreeve.net Let's just say he was very impressed. "I will skip the detailed discussion of the different apertures as it will be very boring. From f1.8 to diffraction limit, this lens performs exactely the same (on my A7iii) with the exception of vignetting wide open. This is nothing short of sensational and probably the best performance we have seen yet on the blog. Seeing that, I have no reason to disbelieve Lensrentals claim that the Sony FE 1.8/135 GM is the sharpest lens out there besides super telephoto lenses."