Roger Cicala at Lens Rentals has simply examined the brand new introduced Sony FE 135mm f/1.8 GM lens (B&H Photo/Adorama/Amazon). He mentioned this lens is the sharpest lens out of 300+ lenses they examined.
From Lens Rentals:
“But as far as the test goes, the results are pretty simple. This is the sharpest lens we’ve tested. Period. (At last count, that’s out of 300+ lenses tested.)”
Sigma 135mm f/1.Eight DG HSM Art Lens Vs. FE 135mm f/1.Eight GM Lens MTF Result:
Zeiss Batis 135mm f/2.8 Lens Vs. FE 135mm f/1.Eight GM Lens MTF Result: