Still not that small. Difference between an A7 form factor and this seems practically negligible. And you still need to stick to short focal lengths and slow apertures to reduce the package size of a FF camera, thus losing the FF advantages anyway. If compactness was something I needed, I would avoid FF in favor of APS-C or m43. Now, if you just want the form factor, well, we all have different tastes. Also, if you want to have the most compact FF setup available and don't care what that does to the end result, well, this shaves a few mm off. I just don't find it something to be very excited about.