According to sports-reference.com.... the highest PER over the past 12 years is Zion Williamson @ 40.84 in 2019. Luka last year led the country @ 35.57. Keegan Murray so far this year is at 56.05. Obviously he won't sustain that level of play as the season progresses and the schedule gets infinitely tougher. HOWEVER, it's more evidence as to how dominant he's been through the first 5 games of the season.