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I had the sigma 35/1.4 and it was superb in every way. For your canon, if you are looking for medium wide field for astrophotography the one and only lens you need consider is the 135mm f/2L. Best glass I have ever owned for any purpose. (where a 135mm focal length is required)
The canon 50/1.4 is a good step up in build over the 1.8II but it's no sharper. That sigma 35/1.4 replaced my 24/1.4L and my 50/1.2L in my bag. And the 135/2 replaced the 70-200 zoom. I now live with three lenses in my bag, 35/1.4, 135/2L and 200/1.8L. The 135 is by far my most used.
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