I added my carddav account from owncloud (6.0.3) to davdroid 0.15.14.
Contacts from my phone do not get uploaded to the owncloud account.
I tried to manually click the "Sync" button in the account but except updating the "last synced" time nothing seems to happen.
I tried adding a test contact manually to owncloud through the web interface and that successfully synced to the device.
Calendar syncs ok.
Device: Sony Xperia M
ROM: CyanogenMod 11