George Foreman had poor technique to start with, but 68 KO's out of 76 wins shows how long he carried his power and how good he was at finishing a fight.

Foreman 89.47% KO rate
Tyson 88% KO rate

They're closer than you want to give Foreman credit for.


And just for shits and giggles

Louis 78.7% (lower than I expected honestly)
Marciano 87.7%
Vitali 91.11%
Wlad 83.6%
Shavers 91.89%
Lyle 72%
Dempsey 77.27% (lower than I expected again)

So there are the actual KO percentages