Even bumping the zoom in a couple of millimeters from 16mm to 18mm can make a notable difference in image quality. All in all, 18mm is one of the most useful focal lengths for landscapes—right up there with 21mm below.
Any lens is fine for landscapes as long as it conveys your vision. The 16 is a very sharp lens but most times landscapes are captured to show either great depth or compression where the lens is used stopped down. On a 24 MP APS C body any lens is in diffraction at f8 so mild softening and loss of fine details will be a consequence using any lens.
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Frequently Asked Questions
What are 16mm lenses good for?
Uses a 16mm ultra-wide angle focal length. This exaggeration of relative size can be used to add emphasis and detail to foreground objects, while still capturing expansive backgrounds. If you plan on using this effect to full impact, you'll want to get as close as possible to the nearest subject in the scene.