Question: why are mft lenses so expensive?
Answer: You need a 40mm f/1.4 to get the same angle of view and depth of field as a 50mm f/1.8 lens on an APS-C DSLR, which pushes the cost up further. The smaller sensor in the micro four thirds does allow a much greater degree of shake reduction in the camera, in fact m43 bodies have the best stabilization out there.