Thanks manacho2005 and Zaphodmonster, I appreciate your comments
It was fun, so I'm glad that shows! I've used Canon cameras too - 7d, 550d, 600d, 5d mkii, and most recently the c300 - their new $15k behemoth - and while they have ease of use in their favour I've really found the k-5 matches them for movie image quality and supercedes them for dynamic range and editing latitude (apart from the c300), so if you can get the k-5 to do what you want in the first place (which is always a challenge with shutter speed and ISO in movie mode, though the exposure compensation helps a great deal and I shoot with the settings AE locked) then you can get really good looking video.