Mongul took PC Supermans best attacks, and an extended attack at that, and than easily beat him down while comparing him to an insect.
Darkseid put Mon El into a coma with a single attack, took down AMPED PC Superboy and Supergirl after being roughed up by a clone of Orion, and performed feats of small scale reality manipulation (At the end of the series, he had Ultraboy confronting a giant space whale, turned another one into stone or something, robbed Dream Girl of her looks, made Wildfire explode never to reform, and more, all at the same time...)
Darkseid takes this.