I confess that I can taste the steel in many of my high-carbon knives. I mean, when I give a clean knife a lick (eww! yeah right, like you never licked food off your knife.) I can taste the difference between my carbon Master Hunter and my stainless Frost's Clipper. The MH tastes like steel, the Clipper doesn't taste like anything at all. I have not noticed any residual taste on foods that I cut with either knife, nor have my woman and kids..
I'll do you one better. I can smell the difference. No, really. I'll bet you've noticed it too. That faint metallic odor.