The righteous in the World to Come will not all share the same reward. According to Bava Batra 75b, there are tiers—and every righteous person who sees a canopy grander than their own will feel the burn of envy.
God will make seven canopies for each righteous person, based on (Isaiah 4:5): "The Lord will create over the whole habitation of Mount Zion a cloud and smoke by day, and the shining of a flaming fire by night; for over all the glory shall be a canopy." The materials increase in grandeur: cloud, smoke, fire, flame. Each canopy is more splendid than the one beneath it.
The World to Come will also feature extraordinary trees. Rabbi Yohanan taught that God will plant trees of precious stones in Jerusalem, and they will bear fruit continuously. Skeptics asked how stone trees could produce fruit. Rabbi Yohanan pointed to (Isaiah 54:12): "I will make your pinnacles of rubies, your gates of beryl, and all your walls of precious stones."
The passage preserves a teaching about divine humility. Why did God decree death on Adam? To demonstrate that Adam was mortal, not a god. The potential for humans to worship other humans—or to worship themselves—had to be eliminated from the start.
Rabbi Elazar taught that in the future, the righteous will be called "Holy"—the same title used for God—based on (Isaiah 4:3): "He who is left in Zion and he who remains in Jerusalem shall be called holy." The most deserving will receive God's own name as a title.
The overall picture is of a future reality that operates on entirely different principles from the present world. Cities of gems, trees of stone that bear fruit, luminous canopies graded by merit, and the righteous flying to an elevated Jerusalem. The World to Come is not a continuation of this world. It is a replacement.