Free soloing a route up El Cap is unreal, its 3000' of continuous climbing at an extreme difficulty. Climbing a route rated 5.13a is like skiing at 39.5' off, except if he falls off the climb with no safety gear, it's all over.
Most excellent, but human, climbers take 5 days to climb the main lines on El Cap, he did it in 4 hours. Just unreal.