I have three friends who have perfect pitch. They are brothers, blind since shortly after birth. You can hit any note, chord, even dis-chord and they immediately identify every note.
My best friend out of the brothers played with me quite often in past years. He plays piano, keyboard, clarinet, harmonica BAGPIPES, guitar, sax... Doesn't matter what key you play in; you don't have to tell him, he just starts playing.
He once told me that he "sees" each tone something similar to a color. Each note is different, like you immediately know blue, red, green, pink, etc.
He quit playing music professionally some years ago and became a minister, and now performs only in church and for worthy causes. Oh, and he sings perfectly and sounds almost exactly like Ronnie Milsap when he wants to.
When we were working together, a lady would approach the band stand and he would often greet her by name, even before she spoke. He identified the scent! If they wore the same perfume or fragrance, and he had met them before, he "knew" them.
The other two brothers are pretty much the same as far as talent. In a really tragic development, the older brother has lost almost all his hearing. You can imagine what a handicap that is for him. He was the most successful of them as far as a music career, having worked a lot in recording studios and releasing several records.
My friend is Richard Wells, and his brothers are Talmadge (the eldest) and Charles, the youngest.
Here is Richard, recently singing to a track he recorded.