Lagering on the primary yeast gives good results too. This is something that I just started doing. I made a Vienna lager with WLP830 some time ago, lagered it for about six weeks on the primary yeast and it was crystal clear going into the keg. The flavor is super clean as well.
I've been meaning to try that and have not gotten around to it. I transfer to keg and lager. I don't worry too much about getting some yeast in there, but it's not the same as leaving it on the cake.