It has been two years since the first Micro 4/3 camera, the Panasonic G1, was introduced. Quite a few lenses have been made for this format, but where are the small and fast primes, except the 20mm f1.7? The potential for very small and fast primes for Micro 4/3 is there. If they want to, it's not difficult to create 25mm f0.95, or 50mm f0.95 and still keep it relatively small. So, where is the 7mm f2, 12mm f1.4, 25mm f1.2 and 50mm f1.0? Instead, we are bombarded with uber long zooms with aperture as small as a pin hole. Look at the Olympus 75-300mm f4.8-6.7!
Add to this frustration is the lack of truly wide angles. OK there is the Panasonic 7-14mm f4, but it's priced to the wazoo at $1500. It's kind of insane for an f4 lens.
The only thing that keeps me interested in the M4/3 is that I can mount cine lens on it, but the NEX is looking might good right now.