E-m5 vs. Sony Rx1

Any thoughts on this one? I have the e-m5, with some good lenses (Oly 20mm, Pana 25mm, and Oly 45mm). E-m5 with m43 sensor.

My thoughts turn to the RX1, with a full frame sensor. and quite decent lens, fixed.

Reason: Something pocketable (ok, big pockets).

Question: Is there any reason to not think that the image quality will be substantially better with the RX1?

Thanks.

(note: I am also posting this on the Sony forum)