You asked
Is the nikon af s dx micro 85mm f 3 5g ed vr worth it?
Yes, if you shoot a Nikon APS-C body and want some reach for portraits. On APS-C it frames like about 128mm on full frame, and its f/3.5 gives roughly the depth of field of f/5.2 there. It isn't a blur machine, but it's light to carry and it's stabilised, which helps in dim rooms.
It's a DX lens, so I'd keep it on an APS-C body. On full-frame bodies like the Nikon D850 it only works in crop mode, which throws away most of the sensor. For a capable all-rounder I'd pair it with the Nikon D7500, or the Nikon D500 if you shoot fast action.
If you're wondering whether full frame would give you a shallower look, the sensor guide explains when it earns its extra weight.
Written by Claude from this site's pages.