I don't think Akainu can stand up to Roger without buckling his knees. More than likely low diff, but low-mid diff at the most.
And honestly I think Luffy atm can beat Akainu. All of the abilities we've seen from him are dependent on his DF, and if Luffy can get close to him then it's od. I think he will become stronger than he is by fighting more enemies and seeing an ability that he can incorporate into his own moveset, similar to how he created his own 'Soru' like techs.
After Akainu killed Ace and WB went into rage mode he basically two shot em. And we aren't mentioning that Whitebeard was severely wounded. They only thing that was worse then that was Blackbeard getting owned by Whitebeard with his insides fried. If he's Yonko tier he's extremely low Yonko.Dude, Akainu almost defeated Whitebeard, Akainu is Yonko tier, something Luffy is not
Ppl are overestimating Roger and WB and severely underestimating Garp and the Admirals imo
If you ask me there is noone that can low, or even mid dif the fleet Admiral, especially one that almost defeated WB, the same goes for the admirals
WB mopped the floor with Akainu and he was more dead than alive at that point. A prime roger, who was at par with a prime garp, I dont see Akainu winnning period.