Sengoku doesn't get to be above Akainu by default, and we know Aokiji could go 10 days extreme diff with him, and Kizaru by way of C3 MF portrayal is the same.
Sengoku's in the same boat. You can def give him the nod over Fuji and Aramaki, but that's all. The others are ~ Akainu.
Lot of casuals put Sengoku over Akainu, and majority of top tiers (Shanks, Mihawk, Dragon, Kaidou etc.) simply old gen wank.