I feel I may have started a sort of misunderstanding when I posted that I thought sumatras should be "pheasant like" and personally breed toward those characteristics. My thoughts are that although the SOP does not use the word "pheasant", it is describing the bird choosing terms that also describe a pheasant's appearance. eg "fowl of graceful form and distinct carriage"
These fowl living wild in Sumatra would live very much like wild jungle pheasants do. Natural selection favored dark shiny plumage that blends into the deep forest shadows, and birds needed large eyes to see optimally in the dappled light. The birds would have run into dense bamboo thickets to escape predators weaving easily between the bamboo culms because of their "moderately long, firm, muscular, tapering body and compact stern". Because of human encroachment over a long period of time and the inevitable contact with domestic fowl possible crossbreeding occurred with the offspring raised wild and numerous colours developed.
When I go outside in the pouring rain and see my sumatras running through the garden enjoying themselves I am reminded that these are rainforest birds! They are not as domesticated as many breeds that were shaped by the desire or whim of the person breeding them, these birds were shaped by their environment. They can hatch and raise their own young, even still in feral settings. We should always let our sumatras hatch and raise their on broods as much as we can so we don't breed that out of them by accident because we only care about what they look like and forget who they are. And this brings me to the standard of perfection.
First of all, the whole reason for having the standard is to keep the birds the way they were when admitted to preserve the breed, end of story. So we have been given the physical description of the birds and we should use it to choose which birds to breed. But when I read the standard, I see a description of a wild bird. I see more then a "you win" or a "DQ" at a show, I see someone in the past trying to covey to us in the future with a mere physical description, the essence of the birds that we are now doing our best to preserve, the sumatra.