1. When you complete a quest (and report it to the one who gave the quest to you) all members a fixed experience point, e.g 10,000 regardless of the fact that they may have small difference in level of learning skills + the presence of a scholar who is supposed to increase their experience gain. 2. When you hit a monster and a damage is shown in the screen, no experience point is gained. When you kill a monster, then everyone get some experience points but the amount gained is affected by the level of learning skill (+ effect of instructor?)
Hence my knight who has a slightly higher learning skill level actually has almost 1% higher experience than the rest of the team even though he did not hit the monster that often.