If you are recording Audio, the SSM lens will not have the click and grind of the lens movement using autofocus. Manual focus should have less of and issue. If you are doing an 'Arty' video with music over the top you can use any lens. I have had some great video's with music over using a SAL 50/1.8.
|Dirt Hose by poppyjk|
|European bee-eaters by drvanger|
from A Big Year - birds
|Fat Is Beautiful Guinea 2008 DP by MarioSS|
from - Fat is Beautiful - (Woman's Portrait n Black and White+ A Border)