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I've never tried the Sigma 19, but of the "trinity" offered by Sigma (19, 30, 60), it receives the lowest marks. That's not to say it's a bad lens, but as compared with it's two brothers, it seems to do worse in terms of user feedback.
That being said, I used the 20 for a short time and while remarkably small and light (especially if you forego the lens hood which essentially doubles the length of the lens give or take a few millimeters), I found that it had terrible distortion. It was easily fixed in post or if shooting JPEGS, the camera fixes it for you, but I wasn't terribly impressed with the lens, regardless of size.
There's not really another option outside of the Sigma 19 and Sony 20 so I'd say if size is your utmost concern, just go with the Sony as they're likely fairly similar in terms of IQ. And at least with the Sony you have the option to add on the Wide Angle or Fisheye Adapters which fairly significantly enhances the utility of the lens (while affecting the IQ slightly).
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