Also given that Canon is now enforcing its MAP, it's unlikely we're going to see the occasional drops in price that often come a half year or so after new product launches.
If I could get this lens for under $1,800, I would. But assuming I could sell my current 24-70mm for ~$1,300, I'm not really willing to pump anymore than $500 into a focal length I already am perfectly happy with. I'd rather get a new lens.