Ok then... I reread Savage and Plo Koon's fight. Savage was capably holding his ground against Plo Koon who had the aid of numerous clone troopers, and when Koon turned away Savage had the speed and cunning to tear his mask off before he could react, and the fact that Koon's ally was in danger suggests Plo was not dominating Savage while they fought. At the very least this implies them to be around the same level.
Now let's look at Luminara. Luminara lost in a minute to Asajj Ventress when she had a disadvantage. Plo Koon on the other hand was driving Ventress back with a far greater disadvantage. Plo Koon is clearly Luminara's superior by a considerable margin, while Savage was holding his ground against Plo Koon with back up. This is more impressive than anything Luminara is capable of.
This is why I believe Savage to be Luminara's firm superior.