cant say, i've never shot the pro level olys, i'm told and have read that they clam to be very good, and with 2x crop factor their 250 f2.8 sure sounds like a winner to me. I would very much like to put the oly though it's paces, just have not done so yet. . .

I'm a nikon guy but I'm also willing to try anything that will help improve my photography.

check this out: http://www.popphoto.com/cameras/5306/olympus-e-520-first-look.html