A friend of mine hoped (sarcastically or not) if we will all be on the same page in heaven. I think from a few bible passages it is clear that we will all be on the same page.
For example who in heaven will own all of heaven? "The earth is the Lord's, and all it contains, the world, and those who dwell in it" (Psalm 24:1). The quick answer is that God will, but that misses the fact that we are heirs to all of creation: "The promise to Abraham or to his descendants that he would be heir of the world was not through the Law, but through the righteousness of faith" (Romans 8:14). Basically we will all own and govern the whole world together. That indicates an unthinkable amount of human harmony.
Of course all of heaven is a very minor bit of our inheritance, ever increasing joy in fellowship with God is the main entrée. We will Love the Lord with all our hearts minds and souls. That means that anything else we love will be so transformed by love for God that it will be love for God. We will love everything through the lens of our love for God. Since every Christian will do this everyone will be most defiantly on the same page in heaven.