Sony shaved about 0.2 inch off all the F3's dimensions for the 3N, and with the retractable power zoom lens -- compared with the standard 18-55mm kit lens that's shipped with many of the NEX models -- it makes a nice compact package. It retains the large grip as well, which is nice.
The back controls are the same as the F3, though the right soft key is now preset to ISO sensitivity. The playback controls have moved to the top of the camera. It retains the tilting LCD that flips completely up and supports Sony's automatic self-portrait mode.