I bought a used one today, actually, it has barely been used, it was used for film only, probably less than 100 times, and is like new.
I bought a 1.4X TC with it. Its gray and rainy today, but I put on the TC and snapped a image from my front porch. I had to crop 100% due to the distance, and there are some blurs from branches in the image, but is looking good handheld at 1/320 sec due to the lack of bright light. I tried a high iso to get fast shutter speed, but noise was a issue.
Canon 5D MK II, ISO 400, 1/320 Second lens is wide open (f/4 with TC)