Than the CULMINATION of that long running subplot and theme-began in Byrne's run, continued through Post Byrne/Carlin editorial era, thriough to DoS:
As to the original fight and story, yes, DD was stated numerous times to be at least as strong as before, to be growing in strength, to me literally laughing at Suoperman's standard level covnentional attacks, etc:
"is he growing stronger:
"the harder i fight, the more Doomsday likes it! He's been fighting MOST OF THE DAY, but he still seems as eager-- and as strong--as ever! ":
His most effective attack before the end, which dazes DD... he's just laughing at Supe's strikes and Supes is hurrting himself on DD's hide a few pages later:
DD one-shots Matrix Superman -- WELL beyond what a standard Supes could do at the time:
Now here's the last decent shot Supes put in, bloodying DD's mouth, before the end -- HOPING that DD was as tired as he--not NOTING him being tired, just HOPING that he was tired -- which all throughout the last issue until Supes goes all out, he's still dominating him with ease, NO signs of being tired;