Power levels are hard to pin down, since Miracleman enjoys its flowery prose. But lots of talk about how these guys are physical gods. The KM/Miracleman/Miraclewoman fight that happens right before the bank dropping thing is described as flattening what was left of London in a few seconds
Earlier in the series, Miracleman does stuff like casually rip out hearts and fly through people fast enough to make them explode. KM is explicitly described as way out of Miracleman's league, due to never bothering with a human identity. He stayed in jacked up form for 25 years, gaining new powers
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We are thought, and reality, and concept, and the unimaginable