I watched SAO on Crunchyroll, where the subtitles for episode 2 have Kirito saying:
I made it higher than anyone else during the beta test. The reason I knew the bosses skills is because I fought monsters with katana skills on floors far above us.
At the time, I just accepted this as "Kirito is just that good," which was born out by his skills and abilities later on in the series. After all, someone had to be the best.
However, this question claims he lied during that speech, and I've since checked the dubbed version, where he says
During the beta, I made it to floors that were higher than any of the other testers. That's a fact. I knew about the boss 'cause I fought tons of monsters with way more sword skills on higher floors.
The implication of word choice and tone in the dub does sound like the kind of exaggerated bragging that gamers do when they're claiming preposterous things, but the subs don't convey that to me at all.
Is there any information showing whether he was actually lying? Was he just a good beta tester (possibly in the lead group), or was he really significantly above everyone else?