The new Fuji X100S looks like it could give the RX1 some competition.

FF and an exquisite Sonnar lens! The X100 is a great little camera and the "S" looks even better on paper. But the RX1 is in a different category. As far as price is concerned, it's simply the law of diminishing returns which shows here. For the (little) extra the Sony offers one simply has to accept the steep difference in price.