My background : Shot Pentax (K200D, K20D), Canon 40D, Nikon D90, D300, D700, and Sony A850. Advanced amateur. I bought this lens along with the 14-54 II when I moved to Olympus and let me tell you, it's great.
Sharp; fast; good weight for what it is; nice tripod collar; decent macro
Can hunt in certain situations (blame it on the camera); bokeh can get busy