The 85mm 1.4 and 180mm AF-D ED f/2.8 are both really good lenses, plenty sharp even wide open, on the high end cameras like the screwdriver AF is quite fast and very accurate.
The above is of course only the case if you take care regarding how you shoot;
The 180mm lens is quite light for it's focal length, so you need high shutter speed to freeze the moment 1/500 on a D810 I would also recommend the battery grip to add mass to the camera.
If the subject or you are moving use AF-C.
The 180mm Ais f/2.8 ED is a little different optical design, also very good Bokeh - They are very similar though. A mechanical jewel.
To me it looks like your 180 and camera needs to go in for service together.
BTW I once saw a very bad case of a large fingerprint on the inside of one of the rear elements on a 180mm AF-D, it produced very hazy looking images,,,