If you want something with excellent IQ, is fun to use, has a retro look and has some neat features (high flash sync speed, leaf shutter, EVF+OVF) fixed 35mm lens + high quality converters to get 28mm and 50mm FL, go for the Fuji X100/X100S/X100T. I have the X100T and it's the camera I bring on city trips, bike rides, walks, etc. I thoroughly enjoy that camera.
A camera that has superb IQ (apparently almost up to par with medium format), there's the Sigma DP Merrill(s). Very affordable, lowsy processing software, a bit slow but if the light is good (read low ISO) the IQ is really, really awesome! Gary A. knows all about them!