I received my Sigma 19 and 30mm lenses and had a brief play. I am a recent m43 convert from Canon gear (for context). First impressions: - They are tiny and feel well-built. - Focus speed is impressive, near instant. CAF-TR actually works usably. - Focusing noise is almost silent. Barely perceptible. - I didn't experience the startup delay that I'd read about. - Colours are good. Very film like. Not super contrasty. 19mm vs Panasonic 20mm. Pros of 19mm: - Focus speed is dramatically faster. - Looks more normal on EPL5. 20mm sticks out in funky places. Cons of 19mm: - Slower aperture and the limitations of that. - Slightly bigger, but not by that much. Very impressed for the money. Would now consider Sigma's 60mm given the positive experience so far.