Konical, I turned that upside down when I made a small book of reduced images from 5x4 negatives printed about 3" wide. I'd done a similar sized book before from 35mm negatives and even at this small size you can tell the difference in the format's quality, same film and developer for both.

I agree mostly with your comments except I'd say 6x4.6 & 6x6 are closer to superb quality at 12x16 (11x14 is a US size).