when it comes to resolution and sharpness. I don't think it improves a photograph; it is nod a 'nice to have' in my world. In fact I'm almost entirely neutral to it, to the point where it doesn't really register.
At the same time, I appreciate a really well printed photograph, and in my darkroom I always strive for making the very best print that I can make. But that never has anything to do with resolution. Ever.