I am a boob expert. I myself have had cup I, as in the I from INSANE. I've heard of L existing, but they generally require custom orders, no normal store will have those in stock. If someone truly has L, I suggest surgery, cause DAMN.
And yes, had. I had them reduced as I had a rather petite frame (at the time) 75 I.
There was 1,5kg of tissue removed, but don't worry, I still have boobs. Cause I gained some weight cause shit happening I have a decent handful that is 85 F.