That doesn’t look like a fair comparison. Could you rotate your light so that it is facing the camera?
Also, the closest tree to the camera in your example real-world image looks to be something like 100 meters away. Your closest cube seems to be 5 or 10 meters away. I think that scale is important - especially if we are trying to recreate real-world phenomena.
There could be something about non-homogeneous participating media (as there will be some small or not-so-small fluctuations in the density of the real-world fog), but I’m no sure how much that contributes.
I’m going to fire up Blender and see what I can do. If I figure something out, I’ll let you know.