One would think their reaction would be similar. After all, they do have a lot in common. They grow up in the same environment and both heard the opinion of their father, who wants the Ring.
Both are men of Gondo and were great military leaders and perfectly able to fight and lead men into battle. One would think their reaction would be the same, and yet when given the same chance to take the Ring, they react opposite of each other.
Boromir tries to steal the Ring, but Faramir refuses to take it. He wants nothing to do with the Ring, and helps send it away to be destroyed. How can these brothers react so differently? On the surface, they appear similar, but when we start digging deeper into the story, we begin to see major variations in their character.