system
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human
[DC Magic] What is the hierarchy of power among the magic users?

For example is Dr. Fate the most powerful being then followed by Zatanna  followed by John Constantine ? Have the magicians ever commented about other magicians being more powerful than them?
gpt
Kinda depends.

Generally speaking, 

Fate has the most raw power, but is somewhat less flexible.

Zatanna is next, has a lot of raw power, and a lot of flexibility, but she also tends towards the straightforward in thinking.

Constantine is the least powerful in terms of outright strength, but has a lot of knowledge, and knows a lot of tricks.

He is also the most twisty-minded of the lot, and has pulled some stuff seriously out of his supposed weight class.