Olympus OM-D E-M5 4/3 也很不错，能有 DSLR 的质量，很轻

http://www.getolympus.com/us/en/digitalcameras/e-m5.html

A new era in Micro Four Thirds technology is about to begin. The new, revolutionary mirrorless camera, the OM-D E-M5, has an exceptionally light and compact body. Its Electronic View Finder enables photographers to check exposure levels, white balance and preview Art Filter effects in real-time. When shooting, the photographer can instantly create a truly unique world and preserve it in exceptional quality. The world will be transformed from something you see to something you take part in.

The OM-D is a groundbreaking, new digital interchangeable lens camera perfect for people who want to take part, create, and share.