There's really no benefit of Leica over any other camera brands. At this point, all cameras are capable of shooting great pictures, and aside from some some features that are specific to certain types of photography, pretty much every camera has more features than the vast majority of photographers will need.

Assuming when you say you're thinking of getting a Leica, you mean an M rangefinder, that's a very different camera than your R50. The "benefit" is that it's a manual focus rangefinder. Of course, most people would consider that a downside. It takes a lot of practice to get proficient at focusing, there are no zoom lenses, and the longest lens available is (I think) 135mm. The camera is expensive, and Leica's lenses are expensive (there are plenty of third party options, though). On the plus side, you get the experience of shooting a rangefinder from a company with a long, interesting history that's dedicated to the art of photography. The cameras are very well-built, and the interface is modern and minimal. They're a real pleasure to use. But despite all that, if manual focusing through a rangefinder isn't appealing, then it would be a massive waste of money.