I have shot both with the 50mm F1.4 and 1.8 and in my opinion the 1.8 is as good as the 1.4 in terms of optical quality and much cheaper. The image from the F1.4 in F1.4 settings were soft, so I guess I didn't enjoy shooting with it at 1.4. F4 was its sweetspot. If I were you, I would go and buy the 50mm 1.8, cheap lens with great optical quality in my opinion. It is plasticy, but for what you pay for it, it is really a gem.