I'm not saying that displacement maps are useless. Not at all.

But I'm saying they have far less advantages than many people belive.

And if a 2000x2000 pixels 12mb TIF map can't give me a crisp and sharp displacement, then I don't know.

I usually use 2000x2000 jpgs max for all my figure textures because I refuse to participate in that crazy  "bigger is better" texture-size-race that started a few years ago.

Anyway, here are more settings:

The render settings.