I own one and wouldn't trade it except for the mentioned 24-70mm Nikon.
Canon users don't seem to like it as much as Nikon users but I really think that's because of the difference in quality of auto-focus.
If you can find one if good shape- and you would have to actually try to beat one up they are that well built- grab it and don't let go! They are a little hard to find in a Nikon mount sometimes not so little so good luck.