Well, nope nope and nope.
Forget character development, actually Sanji got the worst character regression ever in Wano arc.
1. He used Raid Suit, ruining all the "strong without technology / weapon / DF / genetic" theme he had since day one.
"But but he threw away the suit!!" Yep only to receive power up from daddy's gene. Basically the same. No more good old pre TS normal human Sanji. Nowadays he is nothing more than Judge's son.
2. He went from smart Sanji, Mr. Prince who outsmarted Crocodile, the one who opened Ennies Lobby door; into an idiot who replaces his brain with his dick.
Battle against 2 Yonkos??? Time for prostitutes!!!
3. He went from Lady Protector, saving damsels in distress: saving Nami in Thriller Bark and Dressrosa, saving Tashigi in Punk Hazard, saving Vivi in Alabasta.
In Wano? He didn't appear when Ulti beat Nami to half death (actually RIP Nami if not thanks to Otama's coming).
He could hear Tashigi crying in PH, yet now Nami which is closer to him than Tashigi, beaten to half death and crying but the cold blooded Germa Prince, son of Judge, never coming.