Masculinity means the qualities of being a man.
Any good man is a model of masculinity. I don’t really consider your examples good men, but I guess people can disagree.
For me personally, the answer is Jesus.
Gotcha, though I think the ideals embodied in Christ and the Buddha run counter to traditional ideas about masculinity. Consider what we mean by masculinity in everyday language, e.g. "Be a man" or "Man up." We would agree that these expressions press one to take responsibility for themselves and those in their charge. Part of this responsibility entails preventing the unjust from taking advantage of you and those in your charge, e.g. speaking truth to power when your boss harasses interns. Further, "manning up" implies that you not only SPEAK truth to power, but that you ACT to stop the unjust.
The ideal of compassion embodied by Christ and the Buddha has a complicated relationship with "action." Obviously, I'm referring to the "turn the other cheek" stuff. "Turning the other cheek" involves recognizing the humanity and worth of all people, even the evil and unjust. It also suggests that strength and righteousness lie in our ability to quell our desires for justice and passively endure injustice in recognition of the perpetrator's humanity. In short, compassion compels the followers of Christ and the Buddha to endure injustice even when it's in their power to stop it. That is, they will not "man up" on principle.