Actually this pretender is rated above the "L" that is in question here.
This is from Amazon.com user review:
This was the second lens I got for my E-500. The combination is superb. The lens is fast focusing and razor sharp wide open. I had the 40-150 to compare, as well as canons 70-200 f4L on a rebel xt. This lens is sharper, has better contrast and is faster, worth every cent.