Paul,

Has anyone ever stopped dead in their tracks when looking at your prints and said to you, "My Goodness! You're stopped down entirely too much look at that diffraction!"

If the prints look good, and work for you and other people - the subjects, their friends and family, etc. what are you worried about?

Ron Wisner said it best in reference to his old un-coated Protars "No one has every said, when looking at my prints, 'This must have been taken with one of those 100 year old lenses you use'."