On the audio commentary for "Cradle 2 the Grave," Jet Li acknowledges that the UFC fighters who make appearances in that movie would tear him up in real life ... he trains theatrical wu shu for the movies, not for the ring or the street. That said, I'm sure he's someone that the average hobbyist (e.g., me) would not want to tangle with.
I got to train with Royce Gracie at seminars for 3 days in 2002. Basically like fantasy camp for me. Even got to go out to eat with him twice, once at Outback Steakhouse where he demonstrated that on the road, the "Gracie Diet" consists of eating like a hyena with a tapeworm, and once at a BW3. The BW3 was funny because one of the local punk rock kids saw one of my friends with a Royce sweatshirt on and commented on it, only to have Royce pointed out to him a couple tables away.
Said punk rock kid ran down the street and brought all his friends to meet Royce, it was absolutely hilarious.
It was a sad night for me when Royce fought Matt Hughes. The result wasn't unexpected, just sad, because he's the guy who got me into the sport to begin with.
Below is a link to a group of articles on the "street vs. sport" debate. The articles obviously come down favoring "sport" style training. I agree with a lot of the points they make - not all, but a lot.http://www.straightblastgym.com/street.htm
I do know that I've met black belts and other folks who are supposedly "teh deadly" who are either ridiculously out of shape or obviously unaccustomed to sparring and who kind of freak out as soon as they either get hit or get taken down. And I'm not really very good, like, at all. Like I said, a hobbyist.
If I had to put money on the *average* high school wrestler vs. the *average* martial arts black belt, I'm putting the money down on the wrestler every time, just because I know he's athletic and aggressive and can handle pain and adrenaline dump. If the martial arts black belt in question wears camo BDUs but has never served in the military, I'll give 2-to-1 odds.