According to this article, the quasar (black hole) named J0529-4351 is the most luminous object in the known universe, being:
500 trillion times more luminous than the Sun
To put it in terms easier to understand at a human level, how bright would the quasar be if it were within our galaxy? I'm considering that it is either in place of the current black hole in the galactic center of the Milky Way, or somewhere perhaps less shrouded by dust (if it matters).