Okay, for me, the Lumix G1 (back in late 2008) changed my photography, as it was the first really compact and useful digitial camera I could see owning, with which I subsequently made thousands of images documenting my hometown.
Recently, I acquired a Fujifilm X10 (at a deeply discounted price) and find that its EXR dynamic range mode outdoes the Lumix G5 sensor in dynamic range, if one is careful to accept the tradeoff in reduced pixel resolution in the files, while the X10's smaller sensor gives an intrinsically wider DOF, something that comes in very handy for urban documentation. I've subsequently taken to using the little X10 much more, while my micro-4/3 kit and its excellent selection of AF and manual lenses sits unused.
On paper, the X10 is the inferior camera, but in practice, for me, it rocks. Yes, I'd like an EVF and interchangeable lenses, but for what it is, and costs, the X10 shines. In that respect, a Fujifilm X-series camera has changed my photography.
~Joe