I think you need to supply which body you're thinking of using. Full freme, 1.3 crop or 1.6 crop. Makes a big difference to the answer.
Depends on how you define BEST, and what type of shot you want (head, half body, 3/4 body, full length)
Agree all round 70-200 f/2.8 is best because of its versatility, especially outdoors.
Best IQ is with the 85 1.2 if you are after that narrow depth of field and a tight shot. (this is a very slow AF lens, can't use it for action and I do not use it for weddings except for posed shots)
Best bargin in a portrait distance fixed focal length is the 85 1.8 (this is a fast AF lens)
I prefer 50mm and longer on a crop. The Sigma 85 is a good one. The 70-200 is the most versatile but that comes at the price of size and weight, but the compression you get from 70mm and longer creates a great flattering look.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.