The Rx100 indeed is a good camera but I have high hopes for the x20. According to fujifilm, the x20 can 'outshoot' a RX100. If you are not in a hurry to get a camera, waiting for the fuji would be wiser.
However one thing to note is that there is a lack for raw support for the Fuji Camera. If you mainly shoot JPEG, then it should be fine. But if you like to edit your photos then there might be problems.