Yeah, Kizaru's observation haki just seems alright, nothing notable. Which is fine, he's the light-man that other characters need good reactions to handle, him not having it ain't a big deal.
He seems more defense oriented seeing as his guard was hyped and he's pretty resilient (was still shaken up by both punches though). After he attacked Luffy, had his attacked repelled/used to spin Luffy then couldn't react before getting clocked, it was kinda clear his reactions and observation haki weren't all that. But he still seems in good shape which is a testament to how resilient he is. Not sure if his guard is always on or he's just naturally sturdy.
Perhaps Fuji will be the only Admiral to have Future Sight. Maybe Aokiji, but his reactions might just be attributed to proficient regular observation haki, same for Akainu. Fuji's main thing is great observation haki though so I expect Future Sight from him.
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As for the distance, yeah, it seems pretty big. Not sure if it's across the island or just a couple blocks away, but impressive regardless. Especially since he was also turning the ground rubber in the same chapter, so Luffy's range is pretty ridiculous.