system
Given the following post, respond as if you're commenting on Reddit:
human
[All Star Superman] What exactly did Lex Luther see when he had Superman's powers that made him understand how the world works?
gpt
Everything. 

But for a real answer, he saw the connections of the universe. In general most creatures only comprehend a small percentage of the information we get from our senses. Most of the sounds, smells, etc are discarded to avoid overwhelming our minds. 

Lex was likely able to process all of this information and even more of it thanks to his enhanced senses and intellect. This means being able to feel the vibration of the universe and how every thing and everyone is connected by the thread of space and time. He would be overwhelmingly aware of everything and everyone around him. It would be impossible for him to ignore their presence. 

In short. What Lex saw was that we're all we've got. He was unable to disconnect himself from the rest of the world with the illusion that he was above or better than them.