I've been happily using my Panasonic G3 for years for hiking/backpacking/skiing. The key features for me are the small weight and size of the body and lenses, and the electronic viewfinder. I've been thinking about upgrading the body recently, but all the newer G series are much bigger and heavier, and the GF and GX series don't have a viewfinder. What's the best choice for me in the M43 world? (Or which system should I look at instead?)