Originally i thought that was supposed to be Socrates (since sources claim he was very ugly)
Turns out it is a Hellenistic statue of an athlete, probably in the palaistra (a wrestler).
No, it's definitely a boxer, because he's wearing the cestus.
Can't say i like it though, to me statues of realistic forms are only great if they depict either impressive emotion (as in Laocoon) or amazing beauty of form (as in Apollo Lykeios). Apollo Lykeios is probably my favourite of all Greek statues, and since the remaining one is only a copy, the original might even have been more impressive
To me, the Boxer of Quirinal has even more impressive emotions than Laocoon. Sure, Laocoon displays the emotions much more potently, but the emotion being conveyed is really very simple: Laocoon does not like being killed by snakes.
The Boxer of Quirinal, comparatively conveys the complex mix of emotions happening between rounds. Things are clearly not going well for him, both from his expression, and the nature of his wounds. His body language convey's his tiredness, despite his muscular perfection.
But there's also a nervous anticipation about him. His feet are not flat, his hands are not at rest. He is not hanging his head in defeat but listening upwards, perhaps to a coach, with uncertainty. He is wounded, but his nose, brow and teeth all show that he has been wounded in the past.
It's captured a liminal moment for the boxer. This is a man not in terror of his fate like Laocoon, but uncertain of what his fate is. Bereitschaft, meanwhile, I'm uncertain of that man's fate for entirely different reason.
Bereitschaft means "readiness" but readiness against what? What is he feeling? What might he have his sword out against? He's just standing chin out in a generically heroic pose. Even the genuinely heroic Hermes you've posted offers a glimpse of vulnerability there as well.