Sigma 19mm f/2.8 focuses faster than the Lumix G 20mm f/1.7

My tests so far indicate that the Sigma 19mm f/2.8 is not as sharp as the Lumix G 20mm lens.  This is consistent with other people's findings.

I've also seen that the Sigma 19mm lens focuses faster. Not surprising, since it features internal focus. More importantly, the Sigma 19mm lens allows for faster and more accurate focusing during video recording, according to my head to head test.  See the autofocus test here:

http://m43photo.blogspot.com/2013/01/sigma-19mm-autofocus-comparison.html

This suggests that the Sigma 19mm lens is better for video use, at least as long as you don't need the extra 1.5 stops of aperture. The Sigma lens is certainly more than sharp enough for video use.

At the current discounted price of around US$100 / EUR100, it is certainly a good deal.