I'm not sure he's using Brenizer technique. He wouldn't be able to capture the falling dirt since it's a multi stitched shot... This looks like a single shot take.
As a portrait shooter I can say this is not as difficult to achieve as some believe. Obviously he is shooting with a fast lens 85/1.2, but the important part to look at is the background. He's choosing his backgrounds carefully, most of these portraits are done in a very open environment (field, road, etc). This really clears up the background and creates an illusion of extra blur/bokeh. I use this trick sometimes too (I'm not saying you can achieve this look on m4/3, but it works on different levels with each format).
Earlier I had a lot off my cellphone, now on the computer the blurring is definitely not lens boken in that pay dirt still. Extremely abrupt lower left hand corner straight line blurring finish. Similar setup in Nebraksa Boy photo and Contrast.
Id say he uses multiple blur layers in PS. Increases Saturation and decreases clarity a bit and then split the prefocus and backfocus to muted tones and applies blur.. Overall, I find the effect pretty harsh when compared t Elena approach and others but he has a nice eye for composition and light.
I also feel the background bokeh is fake. It certainly looks fake. The give away is that there is no fall off to the bokeh. 3 inches behind the subject is just as blurry as 3 miles. You can make out the horizon but not the stones 6 inches behind the subject.
The EXIF says it's shot at f/16.
If that's true then the blurr would be fake.
The EXIF I see shows it was shot at f/1.2 and ISO 200.
lol that's a good oneMacro lens! The kids are only an inch tall!