Here is a very interesting latest experiment by the Japanese Impress DC Watch:-http://dc.watch.impress.co.jp/docs/review/special/20090908_313599.html(Article in Japanese, Google Translation in English Here)The following are tested and compared:-1. Sigma 50-200mm F4-5.6 DC OS HSM on K-7, and;2. Panasonic Lumix G Vario 45-200mm F4-5.6 Mega OIS on Olympus E-P1.And then both lenses are zoomed to the
