The avatar might give it away
I love the manga and have really liked what I've watched of the anime so far, the art style and direction are superb, Osamu Dezaki is one of the best. The very thick lines and sketchy/dirty looking texture everything has gives it such a gritty feel. Joe's character arc over time is one of my favorite in manga alongside Johnny Joestar, Guts, and Youko from Twelve Kingdoms. It feels very realistic in the way Joe goes from such a wild violent youth to channeling that wildness and violence into a honed weapon in boxing while also never really just making him become a straight up "goody-two-shoes" like some series might do it. Especially after
MAJOR SPOILERS Rikishi's death <-- only read if you've watched up to episode 53 of the first anime. His guilt is so well portrayed and I love the way he and Yoko have to come together to mourn despite how much of a lone wolf Joe wanted to remain.
Are you watching the first anime currently or moved on to the second one? From what I remember the first anime ends after around vol 14 and the second anime re-adapts from vol 9 and then finishes the series.
I also love Danpei Puck a lot, one of his funniest forms.