Notice the shallow DOF you get with these lenses and sensor size. A lot of people like the m4/3 format because of the increase in DOF you get because of the smaller sensor. These tend to be landscape photographers who require everything in focus from near to infinity. It can however, work the other way around. Because of the 2x factor with the focal length and the fact that the longer the focal length of the lens, the shallower the DOF will be, you can produse effects like in the image above.