Its rare but possible. I have found guys from Japan and Hawaii have larger cocks, China and Phillipines usually small. But those are generalizations.
If they are mixed race, they can turn out larger.
I was recently with an asian MUSCLE guy that was 6'4" (also RARE), total rock hard muscle, and over 9" tool. Get it was my "Ah-Ha" moment ......
What i have also noticed is that what they lack in penis size, they make up for in LEG size. Asians often have GREAT legs and very muscular calves, which I love, so its ALL good.....