It is just that I mostly stick with slower lenses because from the internet and my experience, faster lenses are more difficult to design and not always great at wide apertures. For 50mm, I feel that f2 is the sweet spot and difficult to screw up. f1.4 seems to be a hit or miss aperture, and anything faster seems to be dodgy, atleast the early incarnations.

I just wanted to here what the members on apug had to say because the members here are generally more reasonable.