That's splitting hairs - UTF-8 allows for over a million code points, enough to cover pretty much every written language, and then some (including swathes of emoji characters). ISO-8859-1 has 256 code points, barely enough to cover Europe and America.
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Unicode also has a limited set of characters, mostly those that the unicode consortium has agreed on including in the standard.
That's splitting hairs - UTF-8 allows for over a million code points, enough to cover pretty much every written language, and then some (including swathes of emoji characters). ISO-8859-1 has 256 code points, barely enough to cover Europe and America.