I prefer the 16 for videos as i had the distinctive impression that the stabilized 18-55, rather than helping in stabilizing the image, introduces some vibrations, both with enabled or disabled sss.
And no, i thought about it but it's not the shorter focal that hides the effect.
Wait for other replies, i use the nex almost exclusively to take pics (with the 18-55...funny), for videos i prefer a handycam.