Well, Sanji vs King makes more sense, but i am not so sure about it. It will probably be Queen. Mostly because King got a ''good/normal'' looking Sword/Katana - so he might be a more skilled Sword user. Yeah, Queen got even 2 swords, but it doesn't seem as he would be a Sword based fighter. I might be wrong ofc, we have to see. Not that it matters tho, they were shown as equals, so...only Zoro-boys try to make King>Queen, because they think Zoro will fight him, so they need to make him look stronger than Sanji's Opponent. Would be hilarious to see their reaction if Sanji would fight King. It would be automaticaly Queen > King lol.
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I have thought about something like that, maybe not Freeze but slow down time. But i am not sure if it makes sense tho. Sanji would have to freeze or slow down the whole world - which sounds ridiculous from the size perspective. Maybe he could freeze/slow down time only in a radius, but this sounds weird and this whole thing would make foxy's DF pointless. I am not sure about that.
But Sanji have to get Advanced Haki tho. Mostlikely FS.
Btw. what is your guys predictions about his next bounty?