Which is an entirely different story on its own - natural talent/ability.

Overall anyone who has trained to punch, kick, grapple, throw at full contact will very quickly be superior to people who haven't.

Having a great advantage over someone of course takes time and dedication just doing something for say 4-6 hours a week for 1 year won't mean you can't get beaten by a completely untrained attacker.. But you should be able to not eat haymakers from a drunk in a pub.