SkyTeam Elite supposedly lets you board the plane first (i see those signs on the GA desks all the time), but that's it. all you can do is show up early and hope for the best. i used to think that certain sections of the cabin were blocked for higher fares or something (i had a good streak going on FM for about a month or so), but then i realized that there's no way that a chinese airline could manage that kind of thing. sorry to be the bearer of bad news.

(FYI: i do my best to stay on FM, but i stilll end up taking probably 2-3 CZ one-ways per month, and it's always been like this for me)