there are several versions of the cos-11s. if moke wasn't such an old coot, he would remember more of the differences between the models. (ouch... expect armen to get a SEVERE ass-whooping the next time moke sees him!)
(by the way, moke, a cos-11 user i know just moved to the lbc. if i ever make it down past santa monica, i'll let both of you know!)
jeff, i know it's hard to do when sanken sources are so rare, but in comparing rigs, there's much more to consider than the mics. what were the rest of the respective rigs and transfer info? i know that at least one 4061 source was severely messed with (to detriment or benefit, i don't know) before release to the public.
also, from what i've heard, japanese tapers really have their shit together. a lot of 406x users around here do not. take that for what you will, as well...
i'll take the pepsi challenge with my 4061s any day of the week, but i definitely wouldn't mind borrowing some sankens to try em out and form a better-informed opinion.