I have shot a Leica M film camera for many years but that is of course totally different. For digital, I have been exclusively Nikon, which I find to be very user friendly and intuitive. I simply had to learn my way around the Leica controls, which were initially a bit different, but now I really like the interface. TheRe is also Leica Photos App to learn which has remote capabilities and many other features, but also many software glitches which is a known problem.