MFT is not much better in image qualtity than a mobile phone. The user interface is far worse, it gives me a headache just thinking about it. Olympus E-M1 with 17mm on left. Apple iPhone SE on right.
Sorry, as someone who owns an E-M1, an iPhone 6S plus and a M9, I can say that this statement is clearly wrong. Yes, the supplied pictures of the E-M1 are dreadful, but I managed bad pictures with my M9 even. Add to that, the 17mm lens isn't the highest regarded one of all Olympus lenses, yet, if you systematically get that bad pictures, you need it to be checked.
Indeed, in many situations, the iPhone pictures are "good enough", and of course it is extremely convenient to use, especially, when you plan to use your pictures online anyway. Still, both from the handling, obviously the ability to change lenses, and most of all the image quality, I prefer to use my "real" cameras. The image quality of the E-M1 and the M9 are rather close, depending on the situation the one or the other wins. In low-light, the E-M1 actually pulls ahead, thanks to its CMOS sensor and image stabilization. In general, I just love the images I get out of the M9 though. The Leica lenses have an unique rendering, and of course, 35mm gives you more DOF control. I am very curious about the M10 as I hope it finally pulls distinctively ahead in sensitivity vs mFT.
As it was said before in this thread, where Leica M shines is the compactness of the system. I don't want lenses of the size of a typically 35mm AF lens. While I am certainly tempted by the Sony a7, the size of the lenses keeps the temptation at bay. So for me its mFT for anything I need AF with (and a Pen with the Panasonic 20/1.7 is really tiny), and Leica for everywhere I can live with MF.