Isn't it amazing that we can get so angry at others for the same sin that is tripping us up! James and John and their mother are asking for what all the apostles wanted. The other disciples are angry and jealous of the position that the two brothers were aspiring to fill.
Jesus' example is so different. He is serving and will ultimately give up his life to build his Kingdom. Here his disciples are fighting to see who can have a position of "power." Jesus' point is that there is no one with power but God alone and those to whom he gives it. Our job as his followers is to be ready for him when he returns by living as a servant for others while he is gone.