Better yet, lets break it down page by page?
I'll skip the opening page, because it looked even, it looked like Prime might have punched, but it's unclear, as there'ss no sound effect and they're otherwise locked up..
http://i118.photobucket.com/albums/o106/bigbran1/Superman/Countdown13p04.jpg
After that, Monarch postures saying "I AM POWER" as he blasts Superman Prime, to little effect, as Superman is still right on him claiming "You're NOTHING" and smashed him with a giant. . something. . . Prime, then follows by laying into him with heat vision. Monarch tries to counter firing blind, which Prime avoids.
Next page;
http://i118.photobucket.com/albums/o106/bigbran1/Superman/Countdown13p05.jpg
momentary talking, then Prime tackles him and starts laying into him. Monarch lets off probably his only significant attack of the fight while trying to keep Superman Prime off of him who is quite literally laying into him.
next page:
http://i118.photobucket.com/albums/o106/bigbran1/Superman/Countdown13p06.jpg
Explosion.
Next page;
http://i118.photobucket.com/albums/o106/bigbran1/Superman/Countdown13p07.jpg
character creations to explosion.
Next page;
http://i118.photobucket.com/albums/o106/bigbran1/Superman/Countdown13p08.jpg
Monarch talking to one of his underlings, posturing as if he's almighty and unchallengable. Prime reappears screaming, coming for him, Monarch whips around looking like WTF!?
next;
http://i118.photobucket.com/albums/o106/bigbran1/Superman/Countdown13p16.jpg
Monarch blows up a thrown piece of something, and hits Prime with a blast that has little to no effect as Prime is still right in his face. He claims that he's shrinking back into a boy, even though in that panel, he still looks exactly as he had at the beginning of the issue[and he was only BOY without the amp, not a man at all.]. He makes the mistake of calling Prime a child, which causes him to tantrum. He is then overwhelmed completely, doesn't even get a chance to act.
At what point was he clearly the superior by a large margin in this fight? When he surprised Prime with that explosion off of his back?