mackguyver said:
It looks like we have about 5-6 weeks now...debating whether to sell my 16-35II now or wait to use it for comparisons...
Me too, although in my case it would be the 17-40L I would be selling. From the data and samples so far available it seems like this lens will blow away my 17-40, so really it should be no contest. I've never been very happy with the 17-40, and I did consider the 16-35II as an upgrade. But I don't feel the need for f/2.8 at this FL, and the IQ is not enough of an improvement to tempt me even with the current rebates.
I had therefore been waiting patiently for the rumored 12/14-24 to be announced, but this new 16-35 f/4 is probably a better option for me. I quite often find myself trying to capture poorly lit interiors of historical buildings while on vacation, where the use of a tripod is generally prohibited. In a large building f/2.8 can limit the DOF too much even at 16mm, so I suspect that IS would be of more benefit to me than the extra stop. I don't find myself zooming all the way out to 17mm very often either, so 12 or 14mm might go unused while the greater range at the long end would be handy.
A quick check of completed listings on eBay shows that used 17-40s are still fetching around $600. That's actually not a whole lot less than I paid for my copy new a few years ago - Canon resale values are good enough that it can almost seem like putting down a deposit for a long term loan rather than actually purchasing them! ;D So essentially I would be paying $600 for a huge IQ upgrade, which is very attractive indeed. The only question in my mind is whether the new 16-35 will come down in price over the next few months, but since Canon has chosen to launch it at a much more reasonable price than some other recent lenses maybe the price drop will be less significant?