A couple of Nikon fit Sigma DSLR lenses, not for everyone but if you are still using F mount and shooting Portraits....

[Mostly Vintage Cameras]

Spotted on eBay.

Sigma Art 85mm F/1.4 HSM DG Lens For Nikon 85126321550 | eBay UK
SRP £999 T4 Cameras £799

NIKON FIT SIGMA 135MM F1.8 HSM DG A 85126240554 | eBay UK
SRP £1399 T4 Cameras £899

These are listed as new but of course older model lenses now. Might be of interest to anyone still shooting DSLR.