Have you swapped your DSLR for a MFT?

"On a quick readthrough I cannot see that anyone has said this but the Nex cameras are not MFT but have aps-c sensors and hence aps-c sized lenses so you only lose the mirror vs DSLR."

Loosing the mirror and reducing the flange focal length allows lenses to be built smaller. The APC-S sensor 35mm Fuji lens is smaller than the 25mm m4/3 for example. Leica mount lenses have always been smaller than SLR counterparts. I have a full frame 21mm that is only a little bigger than the Panny m4/3 20mm.

Shawn