Currently, Genis should step all over him, just because of his powers. It was implied that Sentry could have overpowered him intheir brief stalemate, but Quasar's energy output is likely not even close to what Sentry had dished out in their fight already. Q's tough, but not quite on Genis's level.
When he was Captain Marvel, it should be very close. I'd give a slight edge to Quasar, possibly a 6/10. Currently, Genis stomps on him.
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