Holy cow, Karsh is amazing as well. I spend 95% of my time photographing landscapes, nature and city scenes during travel...learning to do portraits like this strikes me as the equivalent of learning photography all over again.
On a side note, I tried a bit of it when I visited home for the holidays, and got this photo of my father. When I was growing up, he was always working on cars in our garage (he's very good at his craft), and my image of him is in coveralls under the hood of a car or pickup truck. I had an idea to capture him like this again (he doesn't spend much time in the shop now as he is pretty well into Parkinson's, but I like how this turned out (available light, handheld so a bit blurry), with the DA 12-24 (cramped garage). What do you think? Pales in comparison to Coupon and Karsh, no doubt!