Reviewers commonly say that speedy lenses from the 60s and 70s are always soft wide open. Some claim they're even unusable if not stopped down and their fast aperture is only valuable for the brighter viewfinder thanks to open aperture metering. Well, this lens was designed in 1965. My copy is from the late 1960s as it's the chrome ring EE version, following the preset version and preceding the black ring version produced until 1972. I initially wanted to buy the famous 50/1.4 but the shop keeper only had the late version, without half stops. I was ready to buy it, but he demonstrated the sharpness of the 57mm instead on his Sony A6600. I was blown away. Another great thing about this lens: it focuses down to 45cm, just like the shorter nifty fifties of that era, which makes for a slightly higher reproduction ratio, great for close-up. Anyway, to illustrate my point: this is shot at f/1.4 and it's rather sharp, quite contrasty, without obvious vignetting (thanks to the large front element) and without flaring (but there's a hood screwed on).