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I tried 2 copies of the Sigma 12-24 on my 5DII, poor edge sharpness, the first copy could only be described as abysmal, the second better, but still not acceptable. Flare performance was poor.
I finally opted for a Canon 16-35. On my copy at least, edge sharpness is still not good enough for the asking price; edge softness is not an uncommon complaint with that lens. I guess the moral of the story is that none of the WA zooms available for FF Canons are up to the demands of the sensor and quality is quite variable even with Canon's L series glass.
The 15mm Canon fisheye suffers from severe abberations at the edges, bright stars or planets end up as noticeably larger triangles. I love mine but it's no Astro lens.
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