I got down to about 6% for a bodybuilding show. It was incredible to look at, but also literally painful to bump into any hard surface, to sit on any hard surface, etc. The amount of bony protrusions you have when the body fat is gone is eye opening. I walk around at 10-13% typically, then lean down for summer and shows.

Most people at 30+ lbs further away from 'having abs' than they think. I see it time and time again.