Diversity among selfed and sibling crossed C. species

[coirchlid]

Im looking particularly at a sibling cross of C. dowiana rosita and a self of C. warscewiczii semi-alba 'Katia'. Both from Exotic Orchids of Maui. How much variation can I expect among siblings resulting from these plants? How much difference can I expect between a cultivar and its selfed progeny? Although I am interested in the orchids named above, my question is for all Cattleya alliance species.

Does anyone have pictures or is able to refer me to online sources with pictures to help me answer my questions?

Thanks,
-Matt