SceneTexture:SceneDepth unexpected results and need help understanding the calculation

We are attempting to use UE4 for some more traditional rendering tasks which require us to get some data passes as well. One of those data passes is the SceneTexture:SceneDepth. However the results we are getting from this pass are not what we typically get and I need some help understanding how your Scene Depth works vs Vray’s.

My lead compositor threw this together for me to help illustrate the issue(See Attached Image).

Any assistance we can get with getting more usable data out of the unreal SceneDepth would be very appreciated.