I have heard of some using the ipad pro as a drawing tablet, in which case it competes with e.g. Wacom, whose prices for their display-drawing-tablets are on par with ipads.
I've been slowly learning to draw using paper and an iPad Pro. Obviously they are different, but the iPad Pro gets a lot of right in terms of responsiveness and pencil pressure.
My daughter is in art school. She was considering a Wacom tablet, then did her research and bought an iPad pro instead. She seems thrilled with the choice.