depends on the boxer and the talent/training the other guy has went thru. Jobber vs Jobber, you gotta go with the boxer. Most mma guys have a poor understand of boxing mechanics and seeing as how the fight starts upright, thats something they need to overcome. A kickboxer beats a boxer most of the time as would a muai thai fighter in mma rules. I'd give vitali klitschko a 100% chance of cleaning out the ifl and he'd atleast be extremely competitive in the more advanced orgs.