Really helpful JerryKnight, thanks. Hmm, hearing a lot of good things about the new Sigma 35mil. Gonna have to check out some reviews, the only thing that bugged me was the onion bokeh property. I might have confused it with some other lens. Please correct me if I am wrong about the onion bokeh part.
No, it looks like there have been some complaints about it on the Sigma 35mm/1.4, but it's not universal. Many people seem to be okay with its bokeh quality, and I've seen example photos that have decently smooth bokeh. Not sure if it's a problem with some copies of the lens or specific circumstances. Just find as many reviews as you can and maybe rent it from one of the lens rental places.
EDIT: Looks like some cases, it might be related to sharpening, and it only seems to show up with out-of-focus point lights. I'm not sure it's enough to avoid the lens.
EDIT #2: Neuro beat me to it.. It's a specific artifact with point lights, and there are methods to avoid it.