Subpar post DOF

  1. hard transition from sharp to blur
  2. No blur in front of focus point
  3. Ghosting (like blurred and sharp images gets blended)
  4. Blurred area can have a sudden hard edge

I used the Defocus node and am interested to learn about other ways, if it’s possible to get better looking DOF in Blenders compositor. I know post DOF is limited to begin with, but this is a lot worse than what other compositors can do.