Sanji is the only good germa and genetic modified human escaped from his evil maker.
Lilith is the only evil vegapunk and genetic modified human escaped from his good maker.
Oda is making a inverse parallel here. Both Sanji and Lilith has hair covering their right eyes.
Sanji Germa genes awakes a little evil sides of him. On the other side, Lilith is evil but seems to have more good than evil.
Basically they are about the same.
Not sure where I can go from here, that's all.