What you seem to know from "sharp" digital prints are algorithmic ways to boost perceived sharpness at the expense of image detail. If you are willing to go through the effort, you can do unsharp masking in the dark room, that's actually where this technique has been invented and named.

Apart from that, make a sharp color negative (decent lens stopped down a bit, good focusing and sufficient DOF, sturdy tripod, and so on, you know the drill), use a good enlarger with proper technique and your image should look reasonably sharp.