I opened my bottled Zwicklbier just now. Raschhoffer Zwicklbier. The suspended yeast has settled out and it looks identical to a bottled keller bier although maybe with a bit more carbonation.
It's that golden Bohemian Pilsner/ typical Czech lager color (halfway between Pilsner Urquell and the deeper gold of Budwar); the bubbles continue long after opening; unlike the bottled Kellerbiers I had. It is distinctly hoppy both in aroma and nose and has a bit of haze just like the keller beers I've had. (This one seems to use Saaz instead of the lemon hops I had in Vienna.)
I can't see a difference between a bottled kellerbier and a bottled Zwickl; they're the same beer to me in bottle except MAYBE higher carbonation in the Zwickl....
Adam