Upload & Sell: Off
I had the 180mm f/2.8 AI-s, together with the 200mm f/3.5, and I still have the 200mm f/3.5. I thought their performance was about equal. However, the 180mm f/2.8 AI-s felt like and looked like a huge hunk of jewelry on the end of my camera (gold ring and all). I was always worried about bumping that 72mm front lens element.
The 200mm f/3.5 is built like a tank, and it looks like a tank, though. Even has a piece of glass covering the exit pupil. And it does have 2 ED glass elements.
It's hard for me to comment on the image quality. Mine is sharp, but at 200mm, there are always out of focus areas. And, I've kind grown out of long lenses, moving to wider angle lenses, so it doesn't see too much use.