DxOMark tested the Sony 50mm f/1.4 mounted on the Sony α7R II. Giving recognition to the excellent low-light performance and edge-to-edge sharpness the lens earned an excellent score of 45 on the DxOMark scale.
"Adding a very fast f/1.4 maximum aperture option to the Sony/Zeiss 50mm lineup will be welcomed by Sony a7 shooters looking for a high-performance, general-use, low-light lens.
"If you’re after the best results from your a7 series hybrid at 50mm, however, the Zeiss FE 50mm f/1.4 is outstanding, delivering some of the best low-light performance and sharpness possible in this category.
"The large manual focus ring, MF/AF switch and physical aperture ring with ‘de-click’ option make it versatile for videographers, and for stills shooters its bright light transmission and SSW motor should facilitate excellent autofocus performance even in low light." - Paul Carroll, DxOMark
You can see the full review at DxOMark.com