In Ikmaalush Shiyam, p.225 it states: "However, the vision of Allah‟s Thaat with the physical eyes in the Aakhirah will be in proportion to the spirit

Answer

In Jannat there will also be classes. All will not be on the same level. It is simple to understand that a Wali who passed his entire life in Ibaadat will be on a far higher level than a scoundrel Muslim who spent his life in sin. The ranks and abodes of the Ambiya, Saaliheen and Shuhada (Martyrs) will be extremely lofty and vastly superior to the Jannat of ordinary Muslims. The greater the degree of Taqwa and Divine Proximity a person has here on earth, the more reward and benefit he will gain in Jannat.

Rewards in Jannat, including the greatest Reward, namely the Vision of Allah Ta'ala, will be in proportion to one's obedience and ibaadat here on earth. Rasulullah (Sallallahu alayhi wasallam) said that Jannat is a vacant field. Every person's land in Jannat is allocated and demarcated. The development and adornment of Jannat is in accordance and proportion to the person's deeds on earth. For each good deed a mansion, palace, orchard, jewels, decorations, etc. are constructed.

Everyone's Jannat will thus be in accordance with his good deeds here on earth. In Jannat there will not be the injustice of 'equality' for unequals. Those who ruin and destroy their earthly lives in sin and transgression will not be on the same level as those who struggled and suffered in the Path of Allah Ta'ala here on earth.