I moved to Tokyo a year ago. The tech startup scene here is slowly evolving, but even though it might be slow, the intesity and quality is extordinary. I met incredible people. One of my friends is the best example for how this whole country works. 6 months ago he said to me he can't write me a message on Line because he's not tech savvy. In October he came to me and said, I have a dream, I wanna build a self-driving machine (he's around 40, a manager in heavy industry). We met up every week on sunday to talk about programming languages, AI, ML, sensors, ... every week he came with another pile of books on maths and tech, drawing maps of networks, explaining to me IoT and how to build an almighty algorithm. 6 months, and he's at a level I could have never imagined.
So watch out SF. Tokyo is coming.