My left is slightly bigger than my right, not that either is that big to begin with. If I need something with more coverage than a soft cup bra, I buy the Playtex ones that come in half cup sizes because I'm bigger than an A but not quite a B. Now, when I was breastfeeding, that was a different story.
My b/f loves them just the way they are. He even asked if I'd ever considered getting implants. I said no way, and he was relieved. He thinks they're perfect as is.