I'm 7.0" BPEL (6.5 NBPEL) x 5.5" girth, and have seen people bigger in person, including in the 8"+ range, but overall the percentage compared to other sizes, including ones just under that size, is low.
We swing, so I've seen friends that were also smaller, but for the larger ones:
a) same length, but thicker (5.75-6.0" around)
b) longer, but same thickness (7.5-7.75" long)
c) longer, and thicker (7.5-7.75" long x 6" around)
d) longer, and thicker (8.5"x 5.75" around)
GF has also had 2 ex-BFs who were longer, but not thicker. She guessed, with me being 7" BPEL, that they were in the 7.5-7.75 long range (little longer than me, but not as long as biggest friend she's fucked).
We also have a friend that has had few guys 8"+ and bigger 9.5"+...she measured and had pics we've seen.