OK, tried it now and it really works.

Although syncevolution is poorly documented and Contacts doesn't even make the slightest effort to look like a Hildon-application, at least I got all data on the tablet now.

One question about Contacts, though: When you browse contacts or open them, there's a space on the upper right where a picture could be. In fact, it shows photos of contacts I stored with pictures. I would have expected, though, that in all other cases there's some kind of placeholder image (the usual grey head on greay background). There's not. It's a red "X" that looks very much like "error! error! error! error!" to me. Is this only here or is Contacts on Maemo not as polished as it should be?