I have two golden sebrights that I bought from TSC last year. I have a rooster and a hen. I also have 6 other (standard size) hens of various breeds. I believe that each chicken has its own personality, and if they are raised to socialize with people daily, they will likely be a friendlier bird when compared to a bird not socializing with people daily.
My golden sebright hen is very shy. She loves cooked noodles, and the only way she comes over to me is if there is food involved. She is also very flighty. I'm not sure if this is a bantam thing, or not. She lays really well. A lot of times she lays more then my standard hens. She also has the best tasting egg, lots of flavor. She is really shy and cute.
My golden sebright rooster used to be incredibly friendly. He would perch on my shoulder and do chores with me when he was a young cockerel. As he has matured, he has become more aggressive towards me. Again, this doesn't necessarily mean it is a breed thing. To me, every chicken is different. There are some non aggressive sebright roosters out there too, I'm sure. As far as treating the hens, he is a very good boy. He calls them over if he finds a bug or treat. He even used to go into the nest box when my sebright hen was a pullet, as if to say "Here is a good spot to lay your eggs". He loves his hens, and takes good care of them.
My two golden sebrights are inseparable. They were raised together every since they were days old. They love sunbathing together, and perching in trees together.
This is just my experience with my two sebrights. Good luck with yours! Sebrights are very pretty birds.