Have to agree with brown pants and dank bank. Results should be all female, not counting hermies, since your only dealing with X chromosomes and no Y. Also, unless the plant your selfing is 100% homozygous, highly unlikely, you will have some variation. It may be in traits you can't see or measure, it may be very subtle, but there will be variation. Like BP said, you need to grow out hundreds of seeds preferably more to get a clear idea of the variation in the S1 generation.
Odds are there will be less variation than you will get with a sib mating unless your comparing severely inbred sibs and maybe F1s from an s1.
Odds are there will be less variation than you will get with a sib mating unless your comparing severely inbred sibs and maybe F1s from an s1.