difference between canon 50mm 1.2 v s. 85mm 1.2

hello,

i am interested in Canon 50mm 1.2 or Canon 85mm 1.2. what are the differences between the 2?
is there an advantage in portrait photography with either of these 2 lenses?
trying to decide between these 2.

does anyone recommend owning both of these prime lenses if you could afford it?

thank you