They are not 'sharp' because there is no silver grain left in them. The image is a dye image.
These chromogenic films are very good at huge amounts of overexposure though, so they can be useful for simple cameras, which lack any expposure contols.
When a new (to me) old junker/underloved camera comes into my growing trove, and I work to bring it back to life, I always try to shoot a roll in it. I print up a good image from that roll and hang it on one of may many photo covered walls in the house. Then when someone pooh poohs all of the old cameras that I also display, but admires an image, I can always point out it it the photogrpaher that makes the image, and the camera is just one of his tools, and in my case point out the tool used. It is the most fun to do this with the digi crowd at the odd camera club function that I attend.
I do occasionally use bw400cn, but that is because I have about 200' of a 12" wide roll of outdated RA-4 monochome paper that usally just lives in my freezer that I occasuionally like to put though its paces when I otherwise am planning to have the roller processor going to do other ra-4 printing. It is much easier to just use verichrome pan, ar failing that, xp-2 and dlal in the right amount of mask equivalent but alas my stash of VPL is dwindling.