I'm renting one ATM. Wasn't loving it for outdoor shooting, but some indoor candid shooting last night with my ZM Sonnar has made me a believer (though not a buyer). It is my belief that the camera comes alive at higher ISOs. Some of the shots I have left untouched, and the beautiful long grays are something else. That being said I recall loving the B&W JPEGS out of my M8, too (but its high ISO results were lackinng, IMO).
See my youtube channel for my daily reports and thoughts.