That sounds pretty much like what I did myself. I had a Nikon D3 along with some very good lenses. Then I got a X100, which made me realize how much a small, compact, but capable camera actually get used instead of sitting on my shelf at home. I got used to the EVF as well, and then I tried the Olympus. I sold my D3 and all my lenses, and I now use the OM-D with 12mm, 45mm and 75mm lenses. The X100 still gets a lot of use, and I use them both together pretty much all the time. The X100 stays, and the only thing I'll ever replace it with is a X100s.I added an X100 to my Nikon stuff, and soon was shooting almost exclusively with the Fuji. I kept the DSLR for the odd wide-angle or tele shot.
When the E-M5 came out, I decided to get one and sell my Nikon gear. I soon had 4 lenses to go with it.
But my X100 stays!
Those are not the limitations of the m43 system - those are the limitations of the EP3 and the older 12mp sensor that all Olympus cameras prior to the OMD used. The newer 16mp sensors, particularly those used on the Olympus OMD, EPL5, EPM2, and Panasonic GH3, are FAR FAR better in low light and have far more dynamic range than those earlier sensors. I know the EP3 is not that old a camera, but the sensor in it dates back to 2008 or 2009, which is a loooong time in sensor development terms. They've just gotten a LOT better, but it took Olympus a while to source a better sensor than the one Panasonic had been offering them. I agree there's something special to the Fuji images and colors, but in terms of low light one of the modern m43 bodies is arguably right there with the X-Trans sensor and slightly ahead of the X100. Don't sell your system - sell the body and update it to the OMD or EPL5, depending on the features you want. Or wait and see what else they come up with - there's a rumored EP5 coming along sometime this year that will certainly have the same better sensor.I have both the X100 as well as an E-P3 with the Oly 12mm, PL25mm, the kit lens and the Oly 45mm prime. I took both systems with me in a recent trip to Europe, and some parts of asia. I love both systems very much, but the limitations of the m4/3 systems really showed through in Europe, where the sun set early and darkness settled in. The images were grainy, and the camera did not always react the best with the available light. This is where the X100 shone for me.
Sorry, I should have clarified that - yes, those were the limitations of my particular body - and the money from the system, I was thinking of investing into the X-E1 or XP1 . I did use the OMD for a period of time also, but kept the E-P3. Its weird how preferences work - but I am waiting this year for an EP5 before I make my decision.Those are not the limitations of the m43 system - those are the limitations of the EP3 and the older 12mp sensor that all Olympus cameras prior to the OMD used.
Like Melonbread, I too am seeing the limitations of the older m43 sensors (I hate shooting them over ISO 200) which has led me to looking into the X-Series cameras. I know I could pick up an E-M5 and experience better high ISO performance and dynamic range as well as faster AF, but I continue to be drawn to the film-like look of the Fuji images. Like most who have commented here, I also wouldn't replace my m43 system with a Fuji one, but would rather see them as complimentary, even though my m43 system is held back a little by the older 12MP sensor and slower AF.Those are not the limitations of the m43 system - those are the limitations of the EP3 and the older 12mp sensor that all Olympus cameras prior to the OMD used.