Your Enkei I would not call as really matt black though, coz it still got some shine on it, that's why it's nice! I've seen many other rims which are really2 matt color hence practically no light reflections on them and hence look dead IMHO.the special thing with matt black is the grainy effect when there's light on it, it's not actually dead especially under the sunlight.
but must be properly ori painted matt I guess, cheaper rims paint finishing might not be as good as Enkei's original paint! that's why I'm reluctant to repaint it after 5 years eventhough there's some dents and scratches on them now lol