I found myself constantly smiling while watching the film. Smiles and chuckles are contagious as we see Jackson say he knows "exactly what you meant" to his musical director who is intent on putting more "booty" on one of Jackson's funky tracks.
He sings with power and sincerity. His vocals emotes joy, sensuality and soul absolutely and arguably better than he did back in the day.
His voice sounds richer, purer.
The downside to the film is that we will never see the fruition of Jackson's vision for his London shows. The sadness of it all is that all we see of Jackson is all we're left with and This Is It.