Not nearly enough to discern how he fights as much as how ingenious he is(also how retardedly strong he is). He is a powerfull,smart, and skillful master. However we don't have his style, like how we can gauge fights between masters such as Hongo, Sakaki, most osnf, Apachia, and Ma. We have a lot of fight material in a way we don't with Akisame and Kensie. We had a better gauge of the Executioner blades than with Akisame because of their fight with OP Shigure.
You are right about that, now that I have tought about it. We haven seen Akisame fight, but his opponents were not up to his skill level and he defeated them quite easily without taking much damage himself.
Matsuena showed some of his abilities, but not that much. Had he had more time during the last chapters, we might have seen more of the final masters battle that surely would have given us some more insight. Unfortunately he had to cute the masters fight and the other disciples' fight for the sake of Kenichi vs Kajima.
From the bit we have seen from Akisame I would say that he has extreme foresight about what his opponent might do next, even several steps in advance, and he has the skills to react accordingly.
In a fight between him and Ogata, Akisama clearly has foresight and experience on his side alsong with some insane skills.
Ogata is 11 years his junior, that means he is way less experienced.
I'm not sure how their age might play to either side's favour. Usually, when you are talking about profi athletes most quit in ther 30, because their bodies can't keep up with the strain anymore. But then these are super masters who have modified and perfected their bodies (pink muscles etc.), so age might not play any role at all.
Ogata has an incredible love for martial and the most extreme drive to perfect drive to perfect his art. I think his chance with this fight is pulling some moves that Akisame does not expect from him, maybe because they are so new and foreign to him. Or something that is so suprising. because it is incredibly recless. I think he might try so combine SeiDou Gouitsu with another new move as his final attack. Of course, if he does something like that, he might risk his body and sould in the process, but I guess he would be fine with that.
I would hapazardly guess that Akisame wins, with extreme injuries or possibly even dies. But I have not compöetely ruled out the possibility that Ogata does the same thing as Hongou and wins against a stronger opponent by some kind of strategy or even pure luck.
I think I will have to think a bit more about this fight.