actually it's not that heavy, it just usually doesn't make the flying trips , always along in the huge multilens pack that goes in the 5th wheel
and it is one of canon's best, no doubt, although i'm pretty certain my next lens purchase will be it's closest competitor for canon top marks, and that's the equally renowned, claimed by some to be even better, the one, the only, the 135mm f/2.0 L
i really want that lens for the music festival stuff this summer, so i'm squirelling away the extra day of employment each week just for that
and i have to add this, i bought mine used from keh, rated excellent, and i will never part with it unless the canon mount changes and eos goes the way of fd mounts