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58mm is a very classic focal lenght.
Photo newbies probably donīt know lenses like the legendary Minolta Rokkor 58mm f/1.2, Rokkor 58/1.4, Helios 44 58mm/2.0, Zeiss Biotar 58mm/2.0, Nikon Noc 58/1.2, Nikon 58/1.4, Voigtlaender Nokton 58mm/1.4, Canon FD 58mm/1.2 and probably more.
57mm would be a bit more odd, there was only the Konica Hexanon 57mm/1.2 and 1.4 as far as I know.
BTW: I love the 58mm focal length on my Canon EOS 5D - more than the Canon EF50/1.4 and 1.8 and Zeiss 50/1.4 lenses.
Maybe you could answer what I asked in the other thread. What is the significance of 58mm? Not so much as the actual focal length, but as the named focal length.