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I found this http://nerdist.com/who-would-win-in-a-fight-between-superman-and-the-hulk/ article about a fictional battle, ignore the past on the battle if you want but one of the speed feats of Supa said that he is able to perceive events that occur in one zeptoseconds, when Flash (I think that post crisis Barry) can sense events in less than one attosecond, that is much more than one zeptosecond. I wanting to known if this has been considered before and considered outlier, or, if not, find the comic page where was said and check. To being true and accepted, that could put Supa's speed combat/reaction equal to Flash.
