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Nice review, Matthew. The first photo in your review is stunning... Are you SURE it's f/1.8?? on a zoom??!
Trust me, my jaw dropped about the same amount too! It's just that flawlessly sharp.
I have yet to put it to the ultimate test, the AA-filter-less D7100, but judging by how much it is out-resolving my current D5200, I'd say that this lens is a perfectionist's dream come true...
Again, like I said, as a landscape and astro-photographer I only wish the thing were wider!
Of course like everyone has been saying, I'd just about kill for an 18-35 f/2 full-frame, although that would be enormous judging by the relative size (and crappyness) of the likes of the Canon 16-35 f/2.8. Therefore, I'd probably be even MORE in favor of a crop-sensor 11-16mm f/1.8, or anything in that range that could be kept to a "manageable on backpacking trips" type of size. Gosh, if I had a Sigma 11-16mm f/1.8 DC, a 30mm f/1.4, and a 50-150mm f/2.8, (the mk1 version, of course,) ...Then I could have the ultimate Sigma setup composed of lenses almost entirely un-available in the Nikon mount.
I hate to say it, but IMO it is quite a tragedy that Nikon has churned out such incredible DX sensors in the past year or two, especially their stunning 24 MP sensor with and without an AA filter, (I have my D5300 on order!) ...and yet they haven't developed a "pro-grade" crop-sensor lens since, well, the 12-24 and 17-55. (Although I have found the 10-24 to be quite superb!)