Yep Mace asks Yoda if he wants to spar in the comic "Schism" set a few months after AOTC. Yoda replies "Practice I had with Count Dooku. Good enough for me that was."
Yeah so if he sparred equally with Qui-Gon its not unreasonable to assume in an all out he was probably roughly around Maul's level (Maul was considerably above Qui-Gon).
Remember this is 10 years before AOTC. And most people agree that even AOTC Mace is below ROTS Mace.
I would personaly put Mace's combat level something like this:
^ Yeah I did say on the last page its just speculation esp. regarding TPM Mace. We have a much better idea about AOTC Mace though. And of course we know what ROTS Mace can do.
But you're right, doesn't really matter.
I think the whole thing started by someone saying TPM Obi-Wan was =/> Maul, and someone else said thats crazy because that would put Padawan Obi-Wan close to TPM Mace's league..