Well actually, I'd venture that all of this guy's photographs are done on a camera first... 
. But, beyond that, I think you're mistaken. Those effects are achieved with some good ol' New Technology Computer enhancement.
There's no argument about starting off with a good camera, but the rest of the magic is from "near infrared color compression," by Mr. Johnson's own words. Looking at his 4-image example, you can see how digital skills enter into play here.
Your picture is very nice, but nowhere near the examples as posted on Mr. Johnson's site, nor posted earlier in this article. Although your picture shows beautiful clarity and depth of field, the main point of this effect is not the sharpness of the focal image, but the subtle color differentiation due to the layer combinations and adjustments. As you say, it has no digital manipulation, which is why it is close, but not really the same.
Every image will start with a camera first 
, but with Photoshop, a SLR is no longer de rigeur. Today's digital cameras more than meet needs to produce images very similar to yours through blurring, curves, and sharpening techniques.
