The Sigma DP cameras are truly incredible, but the OP asked for a pocketable compact cameras and, though I know we all have different standards, I really do think they are small enough to be pocket cameras.
Of course, if you are curious you can see for yourself at camerasize.com.
That said, the S100/S110 and the RX100 are both truly pocket-sized.
Here's the DP1M and the Canon S100. The DP1M really is pretty large. The S100 with lens protrusion when the lens is folded is thinner than the Dp1's body, and the lens on the DP1 doesn't collapse.