If you find the 16-35 expensive,then forget about Nikon 14-24. The adapters alone can cost ard $300. http://www.novoflex.com/index.php The lens another $3000, I think. If you are willing to pay this kind of price, I will recommend Contax N 17-35 f2.8 [edit: for lanscape].
Have you tried 16-35 MkI? I assumed you are only interested in auto focus lenses. I understand Tokina is coming out with a FF 16-28/2.8.
http://www.tokinalens.com/products/tokina/atx16-28profx-a.html. The Zeiss ZE 21/2.8 is probably the best UWA [edit: for lanscape] but it is manual focus and bloody expensive. Checkout the ZE 21 used in this thread http://www.fredmiranda.com/forum/topic/942989 . If you are into manual focus lenses, there are other options.
Sigma 12-24 is not too bad. But since you already feel the 17-40 not up to your standard, I would not recommend it. But it is quite adequate for me. I remembered I have a lot of fun zooming from 12mm to 24mm and back. The perspective is qute fun.
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IMO, there is no perfect WA zoom, you just need to work between the constrains of the lens.
hi mwp,
this picture and the ceiling one in a later post are all taken by sigma 12-24? or the contax uwa?