I have a few sharp, fast lenses sitting around and I decided to see how they stacked up side by side in terrible lighting (and I was bored). This was by no means scientific and it was done really just on a whim. It's winter and my house is pretty dim at night so I shot a few of my dog form approximately the same location (although he kept moving) with my Canon FD 50/1.4, Konica 50/1.4, Olympus PEN 40/1.4 and Konica 40/1.8. All the cameras were set to f2.8 and shot handheld with natural light. The focus point was the eye in each image. HERE is the link to the images (warning large files). I have to admit I was surprised at the results. I was disappointed at the Konica's performance (both of them), surprised by the Canon's and astonished by the Olympus PEN's. As I said this was far from scientific and mostly I was just testing out the lenses to see how they would perform in dim lighting. BTW...the Canon FD mount is a royal pain in the backside.