There's a reason I'm hanging onto my Nikon 85mm f/1.8G ... Even though Ming (Thein) tells me that the Z 85mm f/1.8 is in totally different league (and he really liked the 85mm f/1.8G!). That said, the short tele I'm most taken with at the moment is the Fujifilm 90mm f/2. Yes, it's bigger and heavier - but such a fine performer ...An 85/1.8 on FF is an inexpensive and a fine lens and offers much.
And yes, the Nikkor is 350 grams; the closest equivalent that I'd love to shoot on M4/3 is perhaps the PanaLeica 42.5/1.2 which is much more expensive and even heavier! Upside down world