People generally have better relative judgement than absolute judgement.

For example, I could confidently tell you one island looks farther than the other, though could not confidently tell you the distance between any of the islands and me.

In fine beverages (coffee, tea, wine, etc.), you can use your relative judgement in comparative tasting to highlight tasting notes. For instance, this coffee tastes more fruity than the other; this tea tastes sweeter than the other.

You can even extend “comparative tasting” beyond food and drink, to figure out differentiating characteristics: this prose reads more clearly than the other; this key switch sounds more obnoxious than the other; this essential oil smells more floral than the other.

While I wouldn't always recommend it, you could “comparatively taste” people too.