Thank you very much for your answer to my question!
I am terrible sorry, because I couldn't add X100 (Fujifilm) in the poll, but the question was, as you said, about cameras with interchangeable lenses. X100 is a great camera. I read a lot of reviews about it, all very positive.
I created this poll to see what the others are using as mirrorless and to understand why.
I intend to buy this kind of camera and I want to be sure that I will choose the right model. My feelings are going to Nikon 1 or Olympus, but I want to see other opinions, too.