I think some surgeons do have different techniques for how the fat is placed. Some have guarded those techniques. Most of the reports I have seen is that when it is done properly that almost always more than 50% survives and typically 60-70 % or so. Ultimately, it is likely still an art form in many ways.
Just want to address this and say it's not a guarded secret, and the surgical field just doesn't work this way. Everyone is using the Coleman method for surgical placement of harvested fat. That is, small aliquots of fat placed a certain distance apart. As far as fat harvesting, everyone does something slightly different - and time and time again, research papers confirm that harvesting techniques didn't affect the outcome.
Of course, surgeons themselves claim 50-80% survival, how can you trust their word alone? Still, as a whole the approval rating of fat grafting has spiked recently and that might be good enough to prove it's working. I'm still cautious, and with all the claims of fake reviews I'll wait for more scientific research papers to show the data.