There are some quite thin adapters which go from MFT to Sony but I can't see any going from Sony to MFT. I think going from Sony to MFT would mean using an adapter with a corrective lens in it and I can't see any.
Googling gets me this...
"sony e-mount has an 18mm flange focal distance while M4/3 have a 19.24mm flange focal distance. it should be theoretically possible to use m4/3 lenses on NEX bodies, but using NEX lenses on m4/3 is impossible."