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The prob with that is mate that most zoom lenses need to be stopped down to be sharp. Most zoom lenses are pretty average wide open - the 16-35 is a big example of that. Though it can shoot at 2.8 it's pretty soft there, and vignettes a bit as well. It really only starts to shine at 5.6 or smaller - though this depends how picky you are. As you stop it down further and further (until f8'ish) it picks up colour/contrast/sharpness & the vignette goes away (mostly).
For terrestial photos, I try not to use the 16-35 wider than say 4.5'ish.
And this is why I mostly use primes.
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