Micro 4/3 really does seem to have it right: the sensor is big enough, but not too big; small enough, but not too small. The cameras are right-sized, the lenses are right-sized. Everything’s in balance. Everything fits.
There are other small-camera, big-sensor options, but for enthusiasts, the real draw for the Micro Four-Thirds system has to be the lens selection. As Matthew Robertson points out:
While other systems are struggling to be invented, Panasonic and Olympus sit on an ever-expanding range of lenses and cameras that is second only to the decades-old Canon and Nikon systems. No, they don’t have tilt-shift lenses or “professional” cameras yet, but Micro Four Thirds is a viable and vibrant system in a way that the others simply aren’t.
I would even argue that the lens selection for Micro Four Thirds is better overall and with fewer compromises than the selection for APS-C DSLRs from the big guns. But that’s an argument for another time.
That said, if someone were to hand me a Sony NEX-7 and that juicy-looking new Zeiss 1,8/24mm, I wouldn’t complain too much.