After a few months of living here in Japan, I decided that my photography gear were too heavy to bring along for daily use. I use to shoot with Nikon Full frame gear for 3 years before I came to Japan. Even though I love my Nikon gear very much I had to let it go to make way for my new system of choice, the micro 4/3, specifically the Olympus system.
I let go of all my Nikon gear and acquired a modest micro 4/3 starting kit.
Even though I love my Nikon gear, the transition was not very difficult... the Olympus E-M5 is as customizable as the Nikon, the buttons may not be as many nor as easy to access while shooting but they are certainly workable. Also, the size difference was staggering, from a DSLR gear of about 3 kilograms down to only about a kilo for the micro 4/3 setup. Since the micro 4/3 system have very good prime lenses, I am slowly becoming a prime convert... the quality of the Olympus prime lenses are superb, and sharp too.
It may not be for everyone but for anyone looking for a good light very capable set up, a nice m4/3 kit is really all you need.