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human
[DC] If Lex had Superman's powers, would he essentially be the "good guy" as well? What would he do with it?

Lex keeps going on about how Superman makes humans useless and all the effort pointless because Superman is essentially a god. So it got me wondering, what would he do if HE had those powers?

Would he hate himself? Would he try to be the new superman? Would he still remain a villain and hate Superman (but not himself) like a hypocrite?
gpt
Not entirely. All Star Superman has this exact scenario, when Lex takes the serum that grants him all powers of Superman for a time, and first thing he does is break out of death row and wreck havok a little bit before actually realizing what sort of power and insight Superman has... but all too late, as his temporary powers wane to zero. 

In more mainstream universe he once gained nearly actual omnipotence by merging with some entity from Phantom Zone - at a cost of not harming anything... and promptly loses this power, since one of his first plans is how to get rid of Superman. 

He got a bit better in New52 version, after getting his hands on New God technology from Apocalypse and upgrading his Warsuit, he seemingly tried to be heroic and put his money where his mouth is on topic of being better than Superman, but that was due New52 Superman actually dying on seemingly permanent manner, so he had no distractions.

So, unfortunately, while Lex Luthor is undoubtedly brilliant, he's also equally obsessed and very *very* hypocritical in his opinions of Superman.