I'm curious about a few things regarding this lens. I have owned the lens for about 8 months now and have noticed some things.
When shooting by hand, do you guys still use the tripod collar? I have a black rapids RS-2 strap, and I feel like the weight of the lens puts a lot of strain on the connection to the camera, so I usually leave the tripod collar on and mount the strap to the tripod collar. As a result, I now actually prefer the feel of the lens and holding it with my palm underneath the tripod collar. The lens feels weird when I shoot without it. I don't like the added weight though.
Also, do you use a UV filter with this lens for protection? This is one I go filterless partly since the lens hood is so deep, and partly because I don't want anything degrading the ridiculously nice pictures this lens creates.
Finally, is it inevitable that when you shoot in public with this lens people ask you about it? I don't mind, but I've noticed people constantly stop to ask about it. Have others experienced the same?