There's been tons of instances where Sanji should better striking speed feats. From the top of my head, fights with Jabra & Vergo stand out. During the first hits against both Vergo & jabra, Sanji showed amazing striking speed. Even with attack speed, he even has his own variant of Luffy's gatling.Please elaborate......
Speed in general:
Luffy > Sanji > Zoro
I really don't get why people say Zoro has amazing striking speed. The only best striking speed feat. (post-TS) he showed was against Hody.