explain Panasonic 20mm vs. Sigma 19mm

Started Feb 26, 2014 | Discussions thread
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tpani
tpani Regular Member • Posts: 236
explain Panasonic 20mm vs. Sigma 19mm
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Just happened to see some sample images taken with the Sigma. Seemed very good.

But, I don't understand these lenses. Can somebody please explain?

Sigma is 1. cheaper 2. slower and 3. bigger (twice as?) than the Panasonic.

Faster should be bigger.

Smaller should be cheaper.

Did Panasonic use special (expensive) glass/coatings/whatever to make something both smaller and faster, or did they come up with a particularly great optical design that Sigma could not match? (I doubt)

What's the deal?

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