Are there different levels of righteousness in heaven?Is it possible for the righteous to notice them,if any?

If they still regret not having done better on earth to reach a higher level of righteouness just because they understand it could have earned them a better reward after they have joined the heaven,it is possible to say there is no peace even in heaven.Hece heaven loses it quality of being a place of perfect happiness.If all the people of differnt level of righteousness enjoy all the gifts of heaven equally well or they don not notice the differece, there is no for religious hierarchy here on earth.