Philosophía
"The devil made me do it"
First of all, Superman wasn't blitzing them at Mach 7. What he lied about doing (as the end of the fight shows) was throw Coldcast at Mach 7 speeds into space, after he had already blitzed him and Manchester Black. Considering the height the atmosphere extends, it is virtually impossible to fly out of it and back nigh-instantly at only the speed of Mach 7 (Manchester Black gets to say "--mother. Craig?" before Superman gets back in his face) It'd take him much longer than that - so fair to say, Superman was going much faster, and then threw Coldcast into space at supersonic speed (as you may notice the line, "If you'd have super-hearing, you'd hear a pop in about 10 seconds"😉.
What we know about his actual shown blitzing speed was that they weren't even able to perceive him as moving to attack, and he did so while covering large distances, since he stood far off and picked them one by one. It's also fair to assume that he wasn't necessarilly in the mood to go easy on them by that point and, suffice to say, Superman is far faster than Gladiator in actual reaction/combat speed, so because he did it, doesn't mean Gladiator can.
Also worth noticing is that Manchester Black's brain attack came in the middle of Superman trying to attack him from a small distance, and he did it casually.
http://i738.photobucket.com/albums/xx28/PhilosophiaKMC/supermanvselite3.jpg
http://i738.photobucket.com/albums/xx28/PhilosophiaKMC/supermanvselite4.jpg
Meanwhile, the fights starts .5 km apart and Gladiator has to cover that distance before Manchester Black starts spreading illusions that fool Superman, takes him apart internally, telepathically and trashes the whole area with him. I give Gladiator the win as long as he goes for the heat vision right at the get go; the most impressive blitz that Gladiator has on-panel (without the narration going into 'nanosecond' type of hyperbolic statements) would be the one already posted, which I have to say doesn't make me believe he'd cover the distance before Manchester wouldn't be able to react, from .5 km away.
So this match mostly depends on what you think of Gladiator's capacity to nigh-instantly accelerate to a speedblitz level capable of killing somebody who is sitting .5 km away and can win the match once he forms a thought, and if so, how many times would he employ that, aswell as his heat vision.
Suffice to say, I'm standing on Manchester's side.