What's kind of lame lately is that if two really strong opponents meet (like luffy vs kizaru), they have to fight for days to have a victor... It was like that since WCI.
Whats more annoying is that usually Oda depicts luffy as the underdog (like vs cracker or katakuri) to suddenly out of nowhere improve and start beating the person. I feel like Luffy will need another 10 chapters of fight to adapt to Kizaru speed and think of a way to counter it, therefore I am pretty sure the fight will be a draw, with Luffy possibly landing a single blow (or even not, which will be sad).