Good Evening Haris,
Earl's comments are on the money. He refers to the 100mm f2 Zuiko's reputation; "wonderful" is a good description for that lens. It has to be one of the sharpest such lenses ever produced. The only negative for me is that I bought it new some years ago (pre-E-bay days) and paid big bucks for it. I don't know what it's selling for these days on the used market, but I'd certainly recommend it as part of any OM system.