Yajin Tensei
Karate Survivor in Another World

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Two action adventure fantasy isekai manga with a lone adventurer meeting other people whilst travelling into places completely new for them (isekai). They actually have enough competence, strength and skill not to be overpowered by monsters, but still decide to create social contact with the inhabitants to learn more about where they're in now. 

Both show the MC being transported/reincarnated into another world. One focuses on a Yakuza member and the other focuses on a Karate Club member. Both emphasize on martial arts. 

This two manga take the same concept in absolutely opposite direction. Karate Baka Isekai elevates karate to a super power, the beauty of the martial art breaks bones and hearts, the perfect purity of his movements can only be compared to the perfect purity of his heart which exists only for karate. The art is dynamic to a fault with brush work as strong as a kick to the back of your head. Slowly the world is won over by our MC and he brings change not only through his heroic actions but the spirit behind them. Yajin Tensei is also about an older dude that only liked karate sent to a fantasy world. But here we consider how lonely your life has to be to reach middle age and only liking the physical training you do on your free time. Karate is ugly and direct, both in combat and in how it's drawn, and being forced to use it as a way to kill is as heavy as anything when you have to constantly kill or be killed but he has to feel in his body every action he does. The world is ugly and dangerous, even in cities there's a constant threat of being stabbed in the back for a few coins and all relationships can, and will, be used as a weakness. And they both started the same year! It's really interesting how opposite both went with the same concept. read more 

Both are Isekai manga which focus on realism and logical thinking without making characters over powerful.