I recently purchase a used copy of the 50-200 SWD and I love it. It is by far the nicest 200mm lens I have ever used. Someone asked me how it compared to my beloved Sigma APO 300mm f4 Tele Macro and I wanted to find out. Today I had a chance to mount both on a tripod and this female cardinal obliged with posing in the same spot for 20 minutes. Here are two @ f4. Olympus followed by Sigma. Not adjusted for focal lengths. Now @f5.6 obviously bokeh is better with the 300mm, but overall sharpness, color, and contrast are very similar. I doubt this cardinal will pose for me again, but I will be getting the EC-14 later in the week and will test it out again vs the Sigma, though I doubt it will be any better.