I'm fortunate in that I work in New York City and get to visit B&H on a regular basis. Adorama, too, but not quite as often because they're located farther downtown. It's like Disney World for photo enthusiasts.
I picked up the Olympus 17mm f/1.8 myself a few weeks ago. In some ways I like it more than the Panny 20 f/1.7, such as auto-focus speed. For sure, it will probably work better at high ISOs on Oly bodies.
Right now, micro four thirds is still the mirrorless system to beat becuase it's the most mature and has the most lenses. Auto focus may be the best, too. But Oly and Panny really need to bring out rangerfinder-style bodies with built-in EVFs.
Panasonic G5 and GX1; Lumix 14-45mm f/3.5-5.6, Lumix 45-150mm f/4-5.6, Lumix 100-300mm f/4-5.6, Lumix 14mm f/2.5, Lumix 20mm f/1.7
Olympus E-PM2; Zuiko 9-18mm f/4.0-5.6, 14-42mm f/3.5-5.6 II R, Zuiko 14-150mm f/4.0-5.6, Zuiko 40-150 f/4.0-5.6 R, Zuiko 15mm body-cap lens, Zuiko 17mm f/1.8, Zuiko 45mm f/1.8
Pentax Q; 01 prime, 02 and 06 zooms