no. After the Choujin Olympics(Kevin vs Mentaro) there are 3 more story arcs, and the manga is still going. These story arcs are The Demon Seed arc with Ashuraman and the new Akuma Choujin attacking the Segei choujins to revive Akuma Shogun, The Young Lord of London backstory arc for RObin Mask, and now the dream tag team arc in the past which is still ongoing.
Choujin Olympics spoiler - In the manga, Kevin Mask wins
Demon Seed Spoiler - Hanzo and Scarface/Eskara are good guys and fight the Akuma Choujin