Looking at the EXIF, the shooter used a 5D Mk II, and probably a 70-200 f/2.8L IS USM (the focal length on the photo is 105mm; the aperture is f/2.8). So, the color's from the L glass and probably good post-processing technique, and the thin depth of field is coming from the long focal length, large aperture, and full frame sensor in combination. It's not a vignette--it's the depth of field blurring objects in front of and behind the focus point.
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