I had to go look it up to see what it is. Interesting.
Only two downsides I see are the price ($2800) and the fixed 35mm lens, with the upsides being compact leica like size at 1/3 the price, full frame for high sensitivity and dynamic range, and 24mp.
If you absolutely know street photography is the only style you ever want to shoot, and you have 3 large to drop on a very single purpose tool, then the camera looks special made you.
Myself, if I was determined to spend $3000 starting out, I'd probably get a D600 with the kit lens, a 35mm prime, and a 24mm prime (which I think would be critical for a lot of street shooting) for about the same price, an LX7 to keep in my pocket all the time. The reason is flexibility. If you are just starting and don't know from experience what you like to shoot... the more flexibility offered by the camera the better as you'll likely evolve tastes and styles once you get started.
I'd tell you to save money for software, but you can use GIMP and watch you tube videos to find your way around it.
For street though, you may eventually want a good b&w conversion program that knows how to hit different film styles just and filters just by picking them (like delta 100 w/ a red filter, HP4, Tri-X and TMAX-3200).
Actually... I just saw the RX100 and wow. Talk about taking a shot directly at the LX5/G12 class. 1" sensor, 20mp, and 28-100mm equiv lens. That sounds like an excellent street camera for $650. The only downside I can see is the aperture falling off at longer focal lengths, and the fact that a u43 is both bigger sensor and lower price.
I have to admit it's tough to pick a camera these days... so many amazing choices.