You say he’s equally clashing, but the first punch that Luffy threw at him made him cough up blood and - *
checks raws* - dealt some damage. You don’t just cough up blood without being affected by something.
That obviously
wasn’t Luffy’s finishing move since we haven’t reached the climax of the fight yet and the typical “final blow that sends character flying or knocks them out”.
Sentomaru approached Luffy shortly after he did that, so the fight will presumably continue next chapter.
The battle isn’t over yet, and we probably won’t find out for… two weeks.