As you become deeper and deeper into photography, it has been my experience that it takes time for cameras of different formats to become comfortable in your hands and going from a Rollei where the camera "sits" in your hand to a camera designed to be used at eyelevel would be especially so. I have a friend who has a difficult time holding my Hasselblad becauses he uses Rollei TLRs. In 35mm, I am more comfortable with a rangefinder Leica than with anyone's 35mm SLR. Don't rush to get rid of any type of camera until you practice with it for a while. All have advantages and disadvantages including Rolleis, Leicas, i.e. all cameras and formats.