For portraits in the 35 to 85mm range - How important is IBIS?

Photography only - hobbyusage - no paid assignments
What are Your thoughts about IBIS when you shoot only 1 person portraits and boudoir within the 35-85mm range?
Mostly homestudio shooting, with occasional "golden hour shots" in a park or a forest-backround.

Do you consider IBIS either wihin the camerabody or the lens crucial to get a sharp image?

Considering the RF 50mm F1.2L with the R8 or R6 mkII