Amazing pics and very informative and well thought answers to my poorly phrased question.
Few years back I attended an exhibit of Ansel Adams work in Vegas. I know what I good BW looks like. What I should've asked is how you do it which many above have explained. Thank you.
Turn saturation way down in Capture One if I'm lazy or open color photo in Photoshop and run Silver Efex 2 if I'm feeling clever. Of course the subject has to support the idea of being in B&W, if you saw your subject in B&W before pressing the shutter, then it'll start looking good from cmd + shift + U.