@sleepyknight Yeah, but in the case of Ishinomori it's also a result of assistants and I recall reading that he'd give them some freedom sometimes to exert their creativity. Mizuki is the one that I really felt that with when reading Kitaro because most of it looks... okay and with minimal to no backgrounds and then there's some double page spread that looks incredible...and then back to okay, however if you look at his one shots he did for Garo they look so much better but obviously on a weekly series you need to cut corners and stuff so it's understandable but I don't feel like there's any of that in Dousei Jidai. Kamimura's sequential storytelling is very impressive but you could find good sequential storytelling in mainstream too, like Ashita no Joe, but even there the character designs are still that cartoony somewhat predictable art style that you see in most manga of the mid 60s to mid 70s, Kamimura on the other hand stands out, what I find most impressive about it is how fearless his lines are, he seems like he figured his style out early and never looked back and even in Garo with people like Yoshiharu Tsuge or Kuniko Tsurita doing some fantastic stuff, they were still trying to figure out their art style, you look at Ryoichi Ikegami and he needed some time to find his style because his early work on like Spider-man is very different from his signature style, and even when he found it he still needed time to develop it into what it is today, the only one that might match that fearlessness could be Sanpei Shirato but I can't say for sure because I haven't read Kamui yet but he kinda gives me that vibe even if his art is gritty and kinda sketchy. Kazuo Umezu does deserve a mention too because he comes out with Disappearing Classroom just a few years later and WOW! though I would say Umezu's sequential storytelling was never amazing and certainly not on the level of Kamimura or Tetsuya Chiba, his creativity and his pencils on the other hand were insane.
Still, as amazing as Tsuge or Seiichi Hayashi were, they weren't doing the weekly grind like Kamimura was with Dousei Jidai and that's what I find most impressive, he ends up doing a crazy amount of pages per month later on. Even if I don't think Kamimura was a better mangaka than them, experimenting with watercolors or whatever he was doing in the double page spread in this chapter just goes to show that he was an illustrator first and foremost and then a mangaka but his skills as a mangaka were still top notch. 70s manga scene was really damn cool.