My philosophy for landscape photography (though I do love tilt shift lenses for architecture) is to get a small number of fast, sharp zoom lenses so I can cover any focal length I need without carrying a bunch of different prime lenses. That will save space in my camera bag and allow me to spend more time taking photos and less time changing lenses. The question I had was: Is the Canon 16-35mm f/2.8L III able to capture sharp photos without comatic aberration, and provide fast wide-angle coverage?