I'd say it's more of a binary distinction. There are people I've worked with who had no notion of their own limits AND had superior ability. Those people would do surprising things as a matter of course, that others might be able to do with time and planning, but most likely would never come up with on their own.
When you find yourself greeted in the morning with things like "Hi, remember we had that chat about how to store timeseries data? I added an arbitrary-precision real type to the database last night and set it up", you are in the presence of one of those people.
(The other thing I've found about these people is that they are usually the opposite of rockstars. They tend to be quiet to the point of zen. Otherwise there are no worthwhile demographic indicators.)
When you find yourself greeted in the morning with things like "Hi, remember we had that chat about how to store timeseries data? I added an arbitrary-precision real type to the database last night and set it up", you are in the presence of one of those people.
(The other thing I've found about these people is that they are usually the opposite of rockstars. They tend to be quiet to the point of zen. Otherwise there are no worthwhile demographic indicators.)