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Well, a rear tire often wears much faster than a front. It's the case with my Heidenau K73 pair, of which I had to replace the rear after 10250km (6370mi) (almost reached the wear mark at the 80k maintenance) while the front looks pretty new, the 2nd rear may wear earlier than this front.
With the Metzeler Z6s it was different, they got worn at the same pace, they were replaced together at 28000km (17400mi).
As a rule of thumb, rear wears faster on a stronger bike, and it also wears faster with more weight on it. My Teresa (650cc 50hp single, used mostly <4000rpm) is not too hungry compared to many other bikes today, yet half of that 10250km was 2-up which may count.
I always inflate the tires more than BMW recommends, sidewall max at most (2.9bars with the Z6s and 2.5/2.7 with these K73s).
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