Sabo has all the advantage when it comes to haki , but Burgess has a much stronger physique. For Burgess jumping from the highest point of Dressrosa and landing solidly and with balance on his feet is a cakewalk, leaving Koala in amazement
The reason Sabo couldn’t comfortably put down Burgess despite the overwhelming difference in haki is his lacking physique. In panel 3 he is forced to disassociate because he would lose his footing and cave in from this attack
by no means does this attack look so fearsome.
Taking a look at Burgess dito, not only did it lift the buildings from their foundation but they also have rather sharp downward angle, suggesting they were cut with a lot of force , way more than that gravity attack at any rate
Burgess would do well against any yonko commander before his newfound devil fruit