The clipping most noticeable on the first action shot is awful.  That's a sign of the codec and DR on the sensor.  Surfer is even a tad dark in that shot.  I'm sure he could've graded and fixed it a bit but it shows a bit of a weakness to me.
It's a beautiful camera with stunning images, but I've done tests on bringing back shadows and highlights in different under and overexposed shots, and couldn't get the results I wanted.  Ultimately why I didn't get one yet.  Curious to see what it's capable of with 4k raw.