Basically, I prefer to use the RD1 - the ergonomics are much better IMO. Up to A3 there really isn't any significant difference between the M8 and the RD1 (from personal experience and prints in hand). The M8 has a lot of plusses - better VF/RF longer EBL, sharper out of camera etc, but I just didn't get on with it - I really didn't like the shutter - noise and vibration - and found that hand holding at low speeds was not as successful as with the RD1 or my M6 and MP. (Hand held at low speeds is important to me and one of the key aspects of RF cameras). Its not a bad camera, its just not for me at this time. YMMV.