Been exclusively a Canon shooter for the few on and off moments in my life that I had time to enjoy photography (learned on a film Rebel back in High School). So I had strong feelings of loyalty towards Canon. Ended up buying a Canon T3i in July for my brother and I to use for conventions and for occasional Youtube videos. Loved the camera and everything that it had to offer but noticed that he was kind of hogging it so started looking at getting a second body. Then I got really jazzed for the EOS M when it was first announced and started patiently waiting and waiting and waiting....
Since I had so much time I started researching other mirrorless cameras. At first it was just to be aware of what was out there and then it slowly became about possibly trying another brand. Looked at the Pen series from Olympus, GH series from Panasonic, hate Sony so the NEX series was out of the question, and Fuji was way too expensive although I like their retro stylings, and then finally Pentax. Just fell in love with the idea of having so many fairly affordable lenses to choose from that I could then also use on a proper Pentax DSLR in the future (blue K30 = AWESOME!). I wasn't initially too thrilled with K-01 design but over time and hours of research the idea of having something totally different from all the other cameras available really started to appeal to me. Then the price drops started happening and it was a no-brainer. Also the constant delays (here in the US anyway) for the EOS M, fairly negative reviews, and high price were all deciding factors as well.
Not to mention the more I learn about and immerse myself into the world of Pentax the stronger I feel that I made the right choice (this forum and it's supportive members being a huge part of that!). I feel that Pentax in general is totally worthy of my support/new-found loyalty and with them being the real underdogs in the market they definitely need vocal supporters especially here in the US.
For anyone who bothered to read all that I hope I didn't bore you too much...