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I recommend this lens. Squeezing it to f/4 or 5.6 makes tad sharp photos.
Even with a steady camera with 30 seconds exposure and stack them gives awesome results. But doe to the rectilinear nature and the FOV of over 100 degrees, the corners look rather distorted, but can be corrected with Photoshop (CS6 or higher) with Filter => 'Wide angle adaptation'.
And the 'moustache distortion' can be corrected with a Photoshop plugin for this lens, although with sky shots it is not a big deal.
Here some single frame examples with f/4 on a partly cloudy sky with FQ Moon in a February night.
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