Olympus is building on its significant micro four-thirds IP (i.e. mirrorless cameras with the M4/3 sensor size) with a premium offering with a stylized, retro look. The OM-D EM-5, digital successor to the long-running OM series of film cameras, has a look straight out of the 70s but specs that should satisfy enthusiast photographers looking for a compact but powerful system. Their PEN series of M4/3 cameras is popular and well-reviewed, and the EM-5 builds on that tech. The difference is in some pro-like features Olympus has added in: a weather-resistant magnesium body, high-FPS EVF, and high-speed autofocus and shooting.