I don't remember if the 'hounds who did the princess cake survey included the one from Delanghe, but I'm here to say it is wOnderful.
The first bite was so good I almost cried. It was so delicious, and I hadn't had food in so long (er, since noon). I was glad I was alone in my office, because it would have been really embarassing to burst into tears in front of someone else--over a cake.
Anyway, the cake: the marzipan was tender and rolled thinly, the whipped cream had a slight hint of sugar and alcohol, the custard was similar to that in the cream puff, the jam layer was just thick enough, and the cake was moist. Yum. I think this version is a little better (and more pricey) than Schubert's. It's been a long time since I've had Copenhagen, but this might be just as good. All three bakeries mentioned do a way better princess cake than Victoria Pastry in Chinatown/North Beach. Delicious. I regret getting a petit four instead of a whole slice. Or a whole cake.
So far (these three are pretty close in my book):
Copenhagen (option of pink or green marzipan)
Schubert's (the prettiest, IMO, and cheapest)
Delanghe (just because it's so ugly)
Victoria Pastry (in Chinatown--awful princess cake. Good other things)
Waiting to try:
Miette (but not terribly hopeful)
Has anyone discovered good princess cake downtown yet?