Karate experts - are they really 'hard'?

[lord trumpton]

Some friend from the past on FB has started his own Karate school and as part of his promotion he includes clips of sparring etc

To me, it just looks like choreographed fighting - they fight in a certain way with certain moves and kicks etc; react to the opponent based on how they read their moves...

How would these black belts fare in the real world against a real hard man? How would they handle a flurry of wild punches, headbutts and wrestling?