I had the chance to buy a D700 for a reasonable price, and since an FX format camera has been on my wish list for a while, I grabbed the opportunity. Althugh I've used it before, I haven't thought much about the size, but from the spec. sheet, I found that it's almost exactly the same size as the F6, my favourite SLR camera.
Big was my surprise when I got the camera and handled it together with its analogue sibling: It looked huge in comparison. Checked the data again: No, they are the same size, just a couple of milimeters here and there. Then I did this (taken from camerasize.com):
And I wonder: Why on earth do digital SLR cameras have to be so darned thick? I understand that there's a lot of electronics inside, but the F6 contains a fair amount of circuitry as well, in addition to a film cannister and a take-up spool. Even the battery is almost as large on the D700.
This is obviously also one of the reasons why the F6 handles better, even if the two cameras weigh the same; because of the thinner body, the grip is much deeper. The fact that Sony has managed to put together the RX1 makes this even more of a mystery.