I saw Mace Windu on the Jay Leno show. He talked with Jay Leno about Episode III, and mentioned the following:
''Didn't die like a punk either!''
I remember it quite good, saw the same show like 2 days later, (re-plays or something) and he said that.
So if Anakin kills him, his vision of toughness is kind of low and non realistic. I think Mace didn' t like a punk, as he said... I think many people attacked him at once, or that he fought alot and was hard to beat.
I am guessing he lasted long, but I still think Anakin got the last blow by Palpatine, freeily.