... Okay, ready?
HOLY CRAP, LOOK AT THESE GUYS!!! Sage and Eddie were out promoting ONE Championship in L.A. earlier this week ... when our camera guy was thirsty for some 6-packs.
The fighters happily oblige to show off their hard-earned bods ... but when we tried to pin them up against each other for an epic ab-off, say "new vs. experienced" ... they refused.
So, we'll take matters into our own hands -- on your left, you have the 23-year-old Northcutt (new) ... and on the right, you have the 35-year-old Underground King (experienced).
Check out what each guy has to say about each other (they're too damn nice for their own good).
WHO HAS THE BEST ABS!?!?! WE MUST KNOW.