Golden copy of 50mm 1.8 II sample picture
I guess I got lucky with mine; I've only had one copy (bought in early 2007) and it's similarly sharp (potentially my sharpest lens when stopped down a bit) and AF is accurate with my 40D and 7D. It was pretty terrible with the 350D I had at the time I bought it though.
It's now been given to my girlfriend, but I still take it out once in a while. My Sigma 50 has much better contrast and bokeh quality, but AF is much more variable and slower too.