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The blur looks just like it came straight out of a camera using a fairly fast (ie, f/2.8 or faster) medium to short-tele lens.  I doubt it was done in PS.  If it was done in PS, the best way would be to take an OOF (out-of-focus) picture of a scene suitable for a background, and take a separate photo of the subject, remove the background from that photo, and put what remains (ie, the intended subject) on top of the more blurry background from the first photo.

Of course, there are many different lens blur filters available, both optical (ie, things you screw on to the front of your lens) and software-based.  The lens blur filter in the latest CC version of PS is supposed to have improved from the old versions, but IMHO, it still doesn't look like real lens blur from any lens I've ever seen.  There area also several 3rd party lens blur plugins for PS.  IMHO, one of the best is the one in OnOne Software's Perfect Efx ... but it's still not the real thing.

Tom M