Kizaru has a definite speed advantage. Sensui can't harm him via physical combat and I don't remember Sensui displaying any abilities similar to spirit guns ect.(Been a while since I've watched YYH, so if someone could fact check me that would be nice). I'd recommend turning logia Intangibility off. I'm sure if sensui wanted to he could speed blitz from the start since kizaru cannot react very fast, but if he allows kizaru even a second or 2 to think, He'd be hard pressed to even see Him moving let alone fighting him on equal ground. So based off my knowledge Kizaru wins under these conditions, but I don't remember to much about sensui since it's been a few years since i took the time out to watch YYH so I'm not going to make a decision until someone else posts.