It is. I shot it back to back for a few weeks with an X100s and it's absolutely notably wider than the X100s. And I've now done a few comparisons with the Olympus 17mm, and its definitely wider there to, which is partly due to the aspect ratio but slightly counteracted by the Olympus being 34 rather than 35. I'd noticed all of this without giving it too much thought. And then I saw an article (it was linked somewhere here but I'll be damned if I can recall where) where a guy was comparing the RX1 to some piece of high end Leica 35mm glass. And part of the analysis got into the field of view. He did some calculations and came up with something in the 31-32 range, which sounds about right to me. And very likely has something to do with my easier than anticipated adaptation to the RX1... I can't vouch for the exact numbers, it's clearly wider - not a figment of my imagination...
-Ray
I think in camera jpegs are closer to 35mm after the barrel distortion correction applied.