I have one.
When I used the 24-85 as my walk around zoom on the D750 it was a useful lightweight, small telephoto.
Now I have the 24-120 F4 I’ve not used it since.
If you are OK with manual focus it is OK for occasional telephoto shots.
Is the IQ up to todays standards or does it show its age ?
105 f2.5 lens test by Fraser White, on FlickrBoth the 105 f2.5 AiS and the 135 F2.8 AiS are great lenses - the below is taken using a D4 (100% crop):
105 f2.5 lens test by Fraser White, on Flickr
I Kept the 105 and sold the 135 but not for any real performance reasons.
Looking into getting this lens perhaps after a recommendation but the person who told me about it tends to exaggerate greatly.
Any owners here with a sober view of it. I was told its sharp as hell yada yada