Sanji hasnt fought someone with the full intention of killing them since TS. He's a completely different fighter when he's just protecting or buying time for others (ie. Vergo, Doflamingo, etc.) He's an absolute beast when he's shooting to kill
I think Sanji's base stats have already grown exponentially since PH anyway. The fanbase will be in complete shambles when he styles on a Calamity later this arc