Olympus M.zuiko 17mm f/1.8 VS 17mm f2.8 VS Panasonic 20mm f1.7 ASPH review by Ming Thein: We're not there yet, but it is a good start.

"That leaves us with the three native AF options. I would not buy the 17/2.8 unless size is a critical priority, or you know that you’re going to be shooting only static objects stopped down; otherwise the slow AF speed will drive you crazy. The Panasonic 20/1.7 is in a similar boat; it’s faster to focus than the 17/2.8 and optically better, but nowhere near as fast as the 17/1.8. The 20/1.7 and 17/1.8 deliver similar resolution in the center, but they render quite differently – the 20/1.7 is

punchier but has slightly lower microcontrast; the 17/1.8 has lower macrocontrast but better reproduction of fine detail structures – i.e. better microcontrast. In the corners, the 20/1.7 is the highest-resolving of the three, but shows strong purple fringing on top of CA which is absent from the other lenses."

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