Crufts: How do you judge whether a banana's better than an orange?

Miniature schnauzers are small, serious-looking dogs with glossy coats, enormous droopy moustaches and big, round, almost sorrowful eyes. There are differences between them, of course, in coat colour, but overwhelmingly they all have those characteristics. And so it's quite difficult, watching several hundred of them trotting around a square of green on little wind-up legs, to work out exactly what marks each one from the rest.