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I am a definite believer in the 17-40. I haven't used the 17-85.
Although it wasn't astro orientated, I took both the 17-40 L and the 70-200L to Sydnet recently, and had to force myself to use the 70-200 (three shots, all from the Opera House of climbers on the bridge), I wish I had just taken the 17-40.
Sharp it is, and possibly you won't fully appreciate this until you point it skyward. If you can I would suggest you try it skyward first (the 17-85 that is) as astro shots ARE demanding on optics.
Gary
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