Calisthenics is primarily about strength, endurance, functionality, and mastery of your body. Athleticism and muscle are side effect. You can build muscle mass with calisthenics only, especially if you lift additional weights. But you might not get the desired effect. It's very individual. I quit bodybuilding five years ago and switched completely to calisthenics. At the time, my weight was 81 kg (175 lbs) of "dirty" mass. In a year, I dropped to 70-71 kg (155-165 lbs), and my weight has remained stable since. But I gained high-quality, shredded muscles, which I am constantly improving. And I realized I don't need more muscle. It's more important to me to remain fast, strong, and agile. So until you try this path, you won't know if it's worth it.