The Sigma 85mm f/1.4 is an awesome lens for portraits. Its two downsides are its form factor (rather large and heavy) and its high price.

Nothing can be done about its form factor (in fact I use a Canon 85mm f/1.8 or the Sony FE 85mm f/1.8 because of their size and weight).

However, the price of the Sigma has been greatly reduced (for a few hours) and the lens is available from B&H for $848 USD with Sony, Canon or Nikon mounts...

https://www.bhphotovideo.com/find/dealZone.jsp

I thought I'd mention this in case any of my friends have this lens on their Christmas wish list.