Whisking egg yolks and wine is neither a sabayon or a hollandaise even though the chef may call it one of those. I really can't even imagine serving that because I've tasted the whisked yolks before adding clarified butter and it really isn't something I would ever serve or even consider by itself, but each to their own.
But the sweet traditional sabayon doesn't contain butter either - so are you saying that its the sugar content which makes the yolks OK? I thought it was more a question of how cooked the yolks are in terms of taste. But I'm not particularly recommending a savoury application. I'd have to try it myself to be sure!
I suppose its now on my list of things I intend to do...