what really differentiate a pro landscape and a everyday landscape, is the knowledge and clever use of filters in your photos.
therefore 14-24 is out of the question. That is why canon still insist with 16-35, but alot of canonist love the nikon 17-35 as it is sharper with better distortion control.
Not that they insist but they never knew that Nikon has the AFS 14-24mm brewing :bsmilie:
http://www.flickr.com/photos/bigsleep/sets/72157594547064548/with/3039572743/
one of the landscapist i really like.
nevertheless, 14-24 is still the sharpest, uwa zoom lens ever produce, legendary.