I received a 25mm DG Lux from B&H today. Comparing that lens with the Pana 20/1.7 on the OM-D brings me right back to the memories of my OM-2n. Back then, I had an OM 40/2 and an OM 50/1.2, so the tradeoffs were similar: speed vs size and weight. Mild tele normal vs mild wide normal. The Summilux seems to be a very sweet lens and balances fine on the OM-D, but if history is any indicator, the 20/1.7 is going to see a lot more use. The form factor is perfect with the smaller lens, and I share Mike Johnston's view that the 40mm angle of view is just about right.