EP3 & Panny 20mm
I have the pana. GX1 camera and the Pana 20 f 1.7 among other lenses.
The focus speed of the Pana 20 is fast in good light on my camera.
In low light it is also focusing pretty fast, when the camera is set to one focus area.
If the focus is set to "pin point" in low light focus is slow and it can hunt a lot.