Ya, the 50 1.2 is not as sharp as the 50 1.4, but it's not bad. I have the 55 1.2, it's worse that the 50 1.2 but if you need the speed it's acceptable. The fast Nikkor lens to have is the 58mm f/1.2 Nocto. It is sharpest at f/1.2 and is tack sharp. I does demand a hell of a price for a 35 year old lens.