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Quite a few people including myself use fast glass in low light situations at night either outdoors or in an interior where a lot of times you have points of light outside the plane of focus. In fact, its something I look for and desire to have because defocused points of light look cool and help give some context and ambiance to an image.
I don't mind the onion on either lens becuase generally the highlite isn't big enough to notice it. What does bother me is the football shapes. In this picture the canon stays nice and round while siggy becomes rather jagged and football shaped. Keep in mind tho, once the Canon is stopped down at all there goes your round highlites because it doesn't have circular aperature.
I am considering purchasing the new 35 2.0 IS, has circular aperature, IS, probably nice vignetting from 2.0. Could be a really nice lens.