^ Eh, what? Starbreaker has been around since the 70's.
Anyhow, this is honestly spite in Starbreaker's favor imo. He has already shrugged off attacks from pre-crisis Superman, with no ill-effect whatsoever:
Tack on the fact the any/all of Prime's attacks, (be it HV, ice breath, physical blows, whatever) would all be absorbed by Starbreaker, thus increasing his own personal power. Plus, Starbreaker would feed on any anguish/fear/pain-based emotions Prime was experiencing. The dude is uber to the nth degree - honestly, this would be closer if it was the entire Sinestro Corps (but even then I'd go with Starbreaker.)
Not to mention that Starbreaker has also been called the most powerful being in the universe on several occasions (hell, he even threatened the entire multiverse at one point.)
Like I said, spite.
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
There's no difference between pre/post-crisis Starbreaker.
In 'JLA v2' #64 (1992), both Starbreaker and Superman recollect their pre-crisis encounter - there's even a little writer excerpt directing us readers to that issue/encounter. Even in the most recent JLA run (#29, iirc) Starbreaker speaks in depth about his first encounter with the League/Supes.
All of his feats are canonical and can be used, from what I gather..
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
Since Starbreaker cannot die, and can feed on/absorb limitless amounts of energy, it really wouldn't surprise me if he was brought down by ridiculous means. Tbh, that's how he has always been overcome in the past (ie. by sheer PIS.)
I mean, despite having already owned Firestorm, GL, Superman, Dr. Light, Icon, and Dharma (the guy who was holding the universe together,) with no difficulty... It would only be fitting that Superman alone beat him. lolz.
We can only hope.
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."