Yes. The conflicts between Sanji and Luffy in the manga often stem from complex circumstances and character developments that drive the narrative forward.
Luffy uses Gear 5 in a significant battle towards the later part of the manga. But the exact chapter or arc can vary depending on how you're reading it.
The novel Battle Through the Heavens could be read on Qidian Chinese Network without any bullet comments. This novel was a fantasy novel written by the web author Tian Can Tu Dou. It described the story of the protagonist, Xiao Yan, turning from an outstanding person to a useless person and experiencing many difficult situations. The specific chapter list and the latest chapters could be found on Qidian Chinese website.
Although there were some emotional descriptions, it mainly revolved around friendship, trust, and longing for the future. In the novel, the friendship between the protagonist Kasugano Yoko and her teammates was more important. At the same time, there were some interactions between the characters that showed their trust and longing for the future, but there was no love element involved.
Luffy is still alive and kicking in the manga. The story keeps evolving with him at the center of the action, encountering new enemies and growing stronger.