There are some relevant parables that Jesus gave to talk about the coming age.
The first one is the parable of the talents (see Luke 19) where God gives to one faithful servant 5 cities, and to another servant 10 cities, according to their ability and effort on earth.
Also relevant is the parable of the day-laborers (Matthew 20), where all the laborers at every part of the day recieved the same wage, even those who had only been working for 1 hour.
I think what these parables show is that though all of God's servants will endter the kingdom, it will be filled with many people of many stations and rankings. Jesus said to His twelve:
...ye also shall sit upon twelve thrones, judging the twelve tribes of
Israel. Matt. 19:28
See also Psalm 84:10,
I had rather be a doorkeeper in the house of my God, than to dwell in
the tents of wickedness.
Even in heaven, someone has to hold the door open. It is a role with less responsibilty, but it would be awesome to hold the door open for the Father! We would do well to consider how our actions today will affect our life to come, lest we merely avoid damnation and say as Job did, "I am escaped with the skin of my teeth."