I´m actually using a Pentax K-5 and the very small and light (but not very fast) Limited-lenses. It´s great for my street work, ultra-portable as system and delivers stunning IQ. But naturally I´m tempted to try the new Fuji-lineup, have never worked with a "rangefinder-style"-camera, and the lenses seem very attractive with their fast apertures (size is another question). I find the price tag (if confirmed) a little bit too steep, probably I will try first a x100, but I don´t think that the XPro-1 could completely replace my actual system. I´m rather thinking of it as a second street-photography setup, that will have its strenghts and weaknesses. All a question of money (how many systems can you afford?), and of vaste/economy of time that you will spend in learning another system (should we really have different systems?).