The sharpest knife out of the box would have to be my Buck 110 Masters in BG42, next would be my Spyderco Endura 98.
The sharpest edges that I have sharpened are on my Blackjack Mamba and my Buck 560 XLTi.
I also have an issue Fairburn Sykes fighting knife that takes a razor edge, but this is not one of my using knives.