I think there are some in the Museum of the City of New York, or maybe the NY Historical Society. Or both! But I dunno, there's something extra-neat about finding them in the wild. :)

It's an L, what's not to like? :) It's naturally sharp as a tack at any aperture, the IS works well, and the autofocus is generally snappy. Maybe the one thing I'd note is that if the lens is focused close and you want to instead focus on something farther away (or vice-versa), it won't do it until you manually turn the focus ring to the general ballpark of your subject, or sort of "walk" the focus from one point to the other by focusing on things in between, if that makes sense. It's full-time manual focusing like all L lenses, though, so I haven't found it to be a big deal (unless I've neglected to put the hood on properly, since when it's mounted in reverse for storage it covers the focus ring). Still, performance-wise, fantastic piece of glass. :)

Oh, I'd note that if you haven't used a proper macro lens before, keep in mind that when working really close-up, the depth of field is tiny and there's an exposure hit as well (apparently it's because focusing close moves the lens elements further from the sensor--focusing really close means you need to increase your exposure to get the same amount of light at the sensor).