Karita Mattila's Kostenicka is a miracle of singing and acting; at nearly 56, her voice remains beautiful and powerful, and she presents the character in all its complexity, very much making her the center of the opera.
I did not love this production, by Olivier Tambosi, the last time I saw it, in LA with Mattila as Jenufa. However, this time, everything came together and it was possible to overlook the overworked visual metaphor of the rocks on stage. I loved the intensity of the blue sky and wheat fields in Act I; you could feel the heat and the slight craziness in the town. And I also loved the falling snow outside Jenufa's window in the second act (much of which I cried through).
Go see it, is all I can say. It's a triumph all around, and something SFO and David Gockley must be, quite rightfully, very, very proud of.