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Few reasons, for one thing you've got several more lbs of lean body mass which helps, but like you said some of it has to do with your "build".
You seem pretty damn chiseled for the 8-10% range, but its worth noting that for your friend he's got roughly 4 more Lbs of fat and the lower you are the more noticeable its going to look. If he's getting to be sub 10% he's not far from having some abs.
Has he tried getting to 8% yet? I can't imagine him not having more definition then a flat stomach as 8%.
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