For anyone below level for this guy and wanting to gauge 'about' what it will take to beat him. I just did at level 59 in a very lucky scrap with him in which I got a lot of blocks in (10 or 12 at least). Adjusted stats were...
str :816
Stm: 590
Cha: 389
Fin: 1040
A friend of mine told me she'd heard to stack Str and Fin so that's what I did and have dueled him every hour I have been awake since before level 50
So, the short version, if you haven't done him yet is probably around level 60 unless yu like getting smacked down once an hour for no real good reason
Belonging to a good studio with built up stat perks would surely help too
also lov e the reward. Epic Sc an t seductive apron of the milk maid. Very nice!