Thanks, AFairley and all who have replied.
Since I've received such excellent information from forum members concerning the E-M1, allow me to ask another related question. In addition to the E-M1, I'm considering the Pentax K-3. I'm looking for a relatively compact, light weight and weather-sealed body. For landscape glass, I want something that matches my own (normal) vision as closely as possible, so a focal length of about 43mm (in FF terms) seems best. I haven't found a weather-sealed prime for either camera with a similar focal length. The Panasonic LUMIX G 20mm f/1.7 is in the right neighborhood for the Olympus, but I'm concerned about taking a non weather-sealed lens into the field. The same goes for the Pentax FA 31mm f/1.8 Limited. Looking at zoom choices, the new Pentax DA 20-40mm f/2.8-4 ED Limited covers the focal lengths I'm looking for, but doesn't seem to be on par optically with the M. Zuiko 12-40mm f/2.8 PRO. For copy work using the K3, the Pentax DA 35mm f/2.8 Macro Limited seems to be the best choice. How do forum members feel about the IQ and performance differences between the two systems. Thanks again for your kind replies and thoughtful treatment of a "newbie".
Thanks,
Nick