Over a year ago, when I made my first dry plate exposures, I did a close-up scan of a small section of the 4X5 neg (scan near left elbow). No "grain" that I could see. I suspect that wet plate would be comparable...?
https://www.dropbox.com/s/4l555mkkn0...g866d.jpg?dl=1
https://www.dropbox.com/s/007ghku20u...close.jpg?dl=1