Everything works fantastic on my BMW F10 (2012) with Navigation Professional, Bluetooth Music with Song Info, Phone with contact pictures (! Didn't even know that was possible until I got the Z10c) and full Message Access Profile with historic E-Mail and SMS access.
The In-Car integration is the main reason why I am torn between iPhone 5s and Xperia Z1c.
The iPhone has the Advantage of "BMW Apps", which allow using Webradio, Facebook, RSS Feeds etc. through the Navigation, as well as iPod Control and Coverart Display.
The Z10 can't do those things, but it can do Bluetooth MAP which is rather important to me also. Webradio can of course be streamed via BT (and controlled on the phone).