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I think I have read somewhere that in the beginning Sauron and Olorin were equal in innate power. Gandalf however was severely restricted in his use of that power, as he was not allowed to use his power openly and couldn't contest Sauron directly using it, (Sauron had no such restrictions). Also, much of his power was lost to him by the process of becoming incarnate when he became an Istari.
As stated earlier, Olorin was by no means the most powerful maia, some more powerful than him that come mind are; Eomwe, Ilmare, Melian, Osse and probably Arien.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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