Your question is hard to answer because you're not clear as to what kind of competition fights you've been in. Points sparring or full contact, timed rounds to knock the other guy out? And how many?
In general, someone trained and experienced fighting in the ring or cage, even once or twice, should be much more capable than the average turd on the streets. Because what leads to these 1-2 or two cage fights, is a lot of dedicated training...not just hitting pads, bags, cardio & strength training, etc...but most important, sparring, which can be from light to full sparring for KO's. This is what separates real fighters from the kata-fighters.
Noobs and toughguys comes into our gym all the time. Some of them want to spar. No problem on the BJJ side, but with standup, they need to show some skills as it's more damaging when they get hit in the face (as they're potential fee paying students). It's pretty easy to pick them apart and make them miss. They gas and get frustrated. Many of them go crazy, throwing full haymakers, one after another. No big deal, usually I can just stop them cold & bloody their noses with just jabs, footwork & defense.
Some Karate Masters told me that if I was able to jab in a streetfight, then I wasn't really in "real" danger. He's obviously not a fighter.
Like this video. This guy is decent, although nothing special. Maybe a mid level amateur fighter. This is one of our exercises, but against other trained fighters and not some slob from the street.
http://www.youtube.com/watch?v=qSX0PCQXiO4