Pretentious is defined as "attempting to impress by affecting greater importance, talent, culture, etc., than is actually possessed." What if someone does impress others because they actually do have a greater importance, talent, culture, etc.? What would be a good word to describe such a person?
Probably notable conveys the idea:
- worthy of notice; remarkable; outstanding:
- prominent, important, or distinguished; eminent: notable artists.
If said person is very young we can call them a prodigy
(pl. prodigies) [often with modifier] a young person with exceptional qualities or abilities: a Russian pianist who was a child prodigy in his day.
Older people, i.e. not children, might be refered to as a virtuoso
a person highly skilled in music or another artistic pursuit: a celebrated clarinet virtuoso | [as modifier] virtuoso guitar playing.
a person with a special knowledge of or interest in works of art or curios.
Other words like expert, hot shot, or master can be used too for specific skills.