It's not even a knife that cuts very well, but the sharpest knife I've ever had straight out of the box is a Medford 187 RMP. I think Medford is a twit and his knives are silly, but I have to admit that thing had a screaming sharp, hair-splitting crazy-sharp edge on it out of the box.
That said, it doesn't matter much how sharp knives are brand new, if you use them you'll be sharpening them yourself to your own standards anyway, no?