I have some stone columns and I am using Micro Displacement. As you can see in the image, the corner is rounded. I have tried using creases, mark sharp. Nothing works. I would like that edge to be sharp as the stone will not be rounded smooth like that. I have tried simple in subdivision panel as well.
Oh sorry, somehow overlooked your last sentence.
How about some supporting edge loops:
Ctrl+R in edit mode and then slide it next to the edge from both sides. Does this work?