The tree falling in the forest isn’t a scientific question, but a philosophical one. Is there such thing as the world as it is or are there just our perceptions of it?
If indeed it is just as big of a miracle to bring someone from a coma back to life, as it is from death back to life, it is because in essence there is no coma, there is no death, and there is no life. There is only our perception of it. For that matter, there is only my perception of it. Whatever “I” am.
But I generally do not live with this assumption, and therefore I assume there is a “you,” and I assume you don’t either live with this assumption. Which means that I live assuming – at least on some level – that things are real. Ultimately this means that healing someone from a coma is less of a miracle than bringing him back to life.