It's around 60€ if you get on a yearly plan. Compared to other cities Berlin is indeed a bit pricy, but the zones A+B are really large.

Also, the public transportation system in Berlin is much faster and more efficient.

(compared to SF, compared to rest of EU not so much)

Berlin has the finest public transit I've ever seen, by a long shot.

Still, you get in places where waiting for a bus to come is longer than just walking to the U/S-bahn station.

Pricy. It is 85CHF for Zuerich for zone 110 which covers majority of the city.