I've always said that Spartan IV's are just marines and ODST's.
Then there are your Fanboys thinking they're as superhuman as Spartan II's.
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They don't have to be. They have superior armor that makes up for their less extreme augmentations.
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Not as superhuman as the SII's, no one has said that, but they are far better than a normal human even outside of armor. In many cases they have augments the II's didn't even have.