85mm 1.2 focus problem?
As its fly-by-wire AF, if the MF is broken then so is the AF. I think MEVBO nailed it: "If he doesn't understand how it works, he may be trying to manual focus with the camera off; which won't work....." (when I bought my first 85L I thought something was wrong also, till I read the manual..lol).
Take any advice given on a forum with a grain a salt. (that includes mine). Nobody is
perfect, though many claim to be.