The Hitman Reborn manga ended with a climactic battle and resolution of the main character's story arcs. But it's a complex ending that's best discovered by reading it yourself.
It's quite similar. The anime of Katekyo Hitman Reborn mostly adheres to the manga, with just a few minor differences that don't significantly impact the main plot or character development.
Overall, the hitman anime resembles the manga to a large extent. There might be some minor differences in the presentation or pacing, but the core story and characters remain consistent.
In my opinion, it gets better. You can notice more details and refinement in the later chapters. The character designs become more distinct and the backgrounds more elaborate.