The real big achievement of the RX1…it is the smallest digital FF camera ever made!
Our super nice readers OG, Ben and Richard sent me some very useful size comparison images. On top you see the comparison with other FF cameras like the Leica M9 ($6500 camera!) and the Canon 5DmarkII ($3400). The RX1 is incredibly small and has the same size of the already tiny Panasonic GX1 (here on Amazon) that uses a much smaller Micro Four Thirds sensor (Click on the image below):
And if you compare it with a Nikon D700 with 35mm f/2.0 lens than you get this (again click on pic!):
From an engineering point of view this is an amazing piece of technology. I hope Sony is reading the SonyAlphaRumors readers comments and make an interchangeable lens version of the RX1. Our readers already have their hands on the credit card for this :)