wow. Glad you're ok
It must be BMW accident awareness 1st quarter or something. I just totalled my 2012 M3 last month on PCH. Your car, however, looks way worse than mine did. I too walked away without a scratch. Great engineering. I used to drive the canyon roads when i had my 335i.....then realized that one small mistake means "over the cliff" OR "into the mountain". Way too much risk to outweigh the benefits. I've even slowed my driving on highways. losing my life is one thing, but taking another's is a whole new ballgame I never want to play.
Glad you walked away and no one got hurt.