Implied Force: The Sentry vs Dr. Manhattan
The Sentry: hyped as to what he could do, but never really has actually done (eg, if the power of a million exploding suns had really happened in WWH, there'd have been no solar system left).
Dr. Manhattan: existed for a dozen issues in a story not crafted for power display. We get hints of what he can do, but again, nothing a handful of other characters couldn't also do.
Thinking inferentially, extrapolating beyond on-panel showings and statements, what would be a top feat for either character, something which really cements home the scope and depth of their power?
Who'd win in a fight?