I am surprised you want to understand something in such detail. It's like the detail is a way of avoiding something.OK
Three aspects of empathy:
empathic concern: longstanding compassionate emotions
empathic accuracy: cognitive ability to accurately infer what the other person is thinking or feeling (not just feel it or think you feel it)
perceived empathy: the target of empathy's ability to understand whether or not the empathizer conveys their empathy in a way that shows they are empathizing
I got this information from Giving Birth to Empathy: The Effects of Similar Experience on Empathic Accuracy, Empathic Concern, and Perceived Empathy, Pers Soc Psychol Bull 2010; 36; 398
Additionally I found this interesting article about empathy and the Five Factor Model
From Personality Characteristics of Hospice Palliative Care Volunteers: The "Big Five" and Empathy, American Journal of Hospice and Palliative Medicine, Mar 2010;
It's interesting to note that the Fantasy subscale of the Openness factor is the one that most strong relates (I don't know if it's correlates but there is a connection) to what people in the MBTI world conceive of as intuition. So for anyone who asserts that intuitives, specifically NFs, would be more empathetic than SFs, according to this study that is not true.
One more article I read:
From American Journal of Hospice & Palliative Medicine Volume 25 Number 4 August/September 2008 (this one is especially interesting)
Evidently with so much confusion over defining what empathy is, of course we aren't going to come to any type of conclusion either, but it's good to be having the discussion. Perhaps it will come down to literally measuring these mirror neurons and seeing who has more and who has less.
If people want to make this about type what if, for example, you have a INFP and ESTJ with equal amounts of mirror neurons? Then what? Maybe the INFP and ESTJ both have empathic accuracy, but the INFP is better able to convey their empathic concern and the target understands this as perceived empathy. It didn't mean the ESTJ doesn't have it, it just means they didn't communicate it. What if the ESTJ chooses to express that empathic accuracy by becoming an health care administrator and the INFP by becoming a therapist? People choose their modes of expression in a way that's more suitable to their particular strengths. That's something I've had to rethink even within the course of this thread.
I don't think trying to make this fit into MBTI is the proper way to go about understanding empathy. It's too much embedded into that response to chalk up to type and functions.