Are there differences in Essence between races, cultures, even sexes?
These categories may be useful in identifying and studying people, but fail utterly as a way of judging people.
Categories like skin color, religion, or class are not binary distinctions but spectrums. Every band of that spectrum has every type of person: loud ones, soft ones, lovers, fighters, straight arrows, crooks, athletes, thinkers, geniuses and monsters, trusted friends and mean cheaters.
The more you know people of different cultures or classes, the fuzzier and slipperier the categorical distinctions become, and the more salient become the individual qualities.
Every person has their own constellation of strong points and weaknesses. Different people are good for different duties, and different inspirations.