I have used the 50mm 1.8II for almost 2 years, and thought I would try out the 50mm 1.8. I wasn't impressed.
the AF motor is MUCH noisier than the 50mm 1.8 II, and I cant see any increase in optical quality. It hunts in low light just as much as the 1.8 II.
people say they dont trust the plastic of the 50mm 1.8 II, however, I feel that if I dropped this lens, Id be just as likely to break it. (plus Ive never dropped it anyways).
Id rather save money, buy a NEW 50mm 1.8II, and move on with my life.
Being disappointed, I am definitely going to sell mine. Anyone want to buy a used 50mm 1.8?