This would be really unfair since people who have full diamond can easily beat everyone else. I also think they shouldn't add pvp to skyblock just because i feel it doesn't really fit, there are enough games that include pvp and i think skyblock shouldn't be one of those.Just imagine a pvp arena area(like the nether and end portal) after you complete a special quest, you can fight people with the loot you have on you from the skyblock you’ve been grinding on. On top of this every kill you get you get to take 10% of there coins and 20% of their exp. This will make a whole new element to skyblock and it’s optional to the player (unless you decide to make quests for pvp) this would add a great risk / reward factor and would be perfect for people who like the fact that you grind for the gear that you fight with. And to counter people trying to get coins/exp by killing their friends, the pvp could be like battle arenas free for all.
please think about it, for skyblock