Err... According to Alessandra, she and Veronica are the only 2 Karlsson Employees to have trained with Kiyomi (besides Kiyomi's assassins).
And yea, I know it wasn't a serious post so I didn't take it serious, but come on... Juliette vs Charlotte? No way Charlotte doesn't fuck her up.
Either way, we still don't know what Jules is capable of as a fighter. However, that's true for Charlotte as well. Just because Charlotte portrays herself as a tough and extremely vicious bitch doesn't make her a good fighter. Anyone can learn to shoot a rifle accurately.
As far as I can tell, both Jules and Charlotte don't look (although I don't remember if they showed us a naked Charlotte in that K1 scene, probably not) too physically strong, so the outcome of such a “fist fight” is NOT a foregone conclusion, in my opinion (although I'm still betting on Jules).
Spoiled with luxury and comfort, both of them may well turn out to be those sadistic bitches who have never fought anyone in their lives, because from birth they each had a golden spoon up their asses and personal bodyguards. The usual story for children inheriting their parents' empires and elite status.