Two cases. Myself from 3/10 to 5-5.5/10, life completely changed.
But the most radical one I think it was some friend of mine, who was pretty short and kinda babyfaced until almost 18 years old. He was incel and never taken seriously and sometimes bullied. He had very very few genuine friends, myself as one of them. He suddenly in the span of around 2 months hit a sudden growth spurt and his face matured, so he then was average height and decent face. I remember not seeing him since the start of the growth spurt, saw him around 3 months later (so a month after the end of this). His life was completely changed, it was insane. He suddenly had a group of friends that actually respected him, has had 2 different girlfriends in a month and in general his overall life was radically different. Achieved more in 2 MONTHS than in the 10 past YEARS. It was the fastest and most insane change in quality of life, since mine took more time and was more gradual. Such is the power of looks for males.