Rule of thumb I learnt in this forum long ago, about cup size. Minus 2 cups from advertised cups.
Mostly squeezed up with paddings. I often see the paddings ML used, and they can be used in bulletproof vests.
If I get a handful of boobs I am lucky. Real D cups far and wide. Laura is a good pair now. Ke er has D cups as well although I visited in the tiger days. Then the few found like Yuan Yuan, Mo Mo, has gone home.
Most Es are saggy these days, gravity that is it. No perfectly round Es. Huan Huan is a rare case.