Conclusion: Having reviewed four other 50mm F1.4 lenses of similar design over the past few months, we weren't expecting any major surprises from the Sony version. And in broad terms it's not hugely different from its Canon, Nikon and Pentax equivalents; as befits a quality prime it gives excellent image quality when stopped down, but struggles somewhat when used wide open, showing common problems such as corner softness, halation, bokeh chromatic aberration, and vignetting on full...
Pros: Unusually good performance on APS-C even at wide apertures, Excellent image quality when stopped down on both full-frame and APS-C, Low distortion
Cons: Very soft across most of the frame at wide apertures on full frame, Bokeh chromatic aberration, most visible at wide apertures, Vignetting at wide apertures on full frame (essentially disappears by F3.3), Corner softness on full-frame - never quite sharp even at F8, Somewhat susceptible to flare
Sony 50mm f/1.4 ( SAL-50F14 ) - Review / Test Report
31 October 2008
Conclusion: The Sony 50mm f/1.4 is a typical representative of the standard lenses that were designed back in the 70s to 80s. The max. aperture (f/1.4) should be generally avoided due to weak contrast, poor borders and a significant amount of longitudinal chromatic aberrations (LoCA). The image quality is already vastly improved at f/2 including a technically better (smoother) bokeh. The truly excellent peak performance is reached around f/4.