Sultans have five toes, feathered feet, and the most popular color they come in now is White. However, breeders are working on black and I've heard blue, though I haven't seen it.
Sultans are supposed to be docile birds, generally. Our roo was the sweetest roo we every had. I loved him very much. The breed isn't good with extreme cold and we noticed when we free ranged, he wouldn't dare come out in snowy weather. He'd rather wait inside for the girls to come back at the end of each day.
Our boy didn't have an annoying crow, but he did crow often. Crested breeds generally aren't good when held unless they know their owner well. They get spooked.
Sultans are, for a fact, slow to mature. I'm not surprised that you haven't heard a crow yet. My boy was almost a year when he first crowed and it took him a while before that because we had higher ranking roos. When they were gone, he stepped up to the plate.
Males will have dread-locked crest feathers. It will take him a little while to truely show the real signs of being a boy. My guy was two years old when he REALLY looked like a guy. Slow to mature, as said. Girls will have poofy, rounder crest feathers. You wll also notice the tail drooping downward in boys, staying upward in girls.
Example pics. He was pet quality and only around 3 months or so in this pic.
Around a year and half in this one, just a few days before he passed away. He was sickly and I have heard that Sultans generally aren't weather-hardy. He developed a respiratory infection this post fall and it crippled him. We loved him very much, but this is always something I would watch out for in the breed. Bantams are small are can fall victom to anything easily.