X100/X-Pro1 still tops for low noise
I happened to check out the noise test for the new Nikon D600, alongside the 5D MkIII, the D800 and the X100.
I was amazed at how well my X100 stands up to the others across the board, actually blowing them away in some areas. And the X-Pro1 is even better.
IQ has always been these cameras' trump card. And for me that's the best trump to hold.