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The 17mm f/1.8 is sharper than any of the kit zoom lenses, and even sharp at f/1.8, at least what it's focused on.
If the lens has a problem, it's field curvature, which causes the edges to be out of focus (front-focused) unless you stop down quite a bit. It's not a lens to focus and recompose, for this reason.
Some people may think it's overpriced given that it's only f/1.8, and it has that field curvature issue.