Sigma 19mm vs Pana 20mm?

Started 4 months ago | Discussions thread
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Kalintz
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Sigma 19mm vs Pana 20mm?
4 months ago

So I couldn't be happier with my EM1 and 12-40 but I was thinking of getting a smaller lens for street photography. 
38 or 40mm (FF) feels like the perfect FL for street photo, for me so it's between the pancake pana 20mm and the Sigma 19mm.
What are the pros and cons of each apart from the obvious 2.8vs1.7 (which doesn't make a big difference in street photo as I usually stay around f8)? 
There is a significant cost difference and a less significant size/weight difference.
So which one do you have/would you get?

 Kalintz's gear list:Kalintz's gear list
Sigma DP2 Merrill Olympus E-M1 Olympus 12-40mm F2.8
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