The shots look, to me, more like they were done with very careful (and likely expensive) lighting and then edited in post processing software. The way the light falls on the subject shows a very elaborate studio light setup that is very hard to duplicate with HDR. Although HDR can be used to achieve some of these results, some key lights are still essential to get that "sparkle" in the eyes and the shadows, just look @ the nose shadows (or the lack thereof) shows some general positions of softboxes. The second one looks more proper lighting and metering to achieve the results, and then tweaking in post processing.