If someone ever got ebola virus, is there even a small chance to survive or is it an automatic death sentence?

Some survive: The ebola virus is highly infectious within a body of an exposed person. This includes an attack on immune system cells which ordinarily marshall defenses against viral invasion and spread. Some in fact have better immune systems than others, and survival is documented It is still best avoided.

Ebola: The death rate is approximately 55% (4 OCT 2014) with the current outbreak but in past death rates have been as high as 90%.