I think there's a common misconception that introverted feelers are selfish and can't identify with the emotions of others. Supposedly for them, emotions are just a self-absorbed way to make judgments about the world. I don't think this is true at all; it might manifest in those with Fi lower on their function order, but I think everyone is capable of empathy (barring those who actually lack the psychological capability).
What I notice is that while Fe is simply spread out to more people. The sort of feeling that an ENFJ has, for example, is not so much deep as it is wide. They're openly empathetic because they're in tune to the general emotions of everyone around them. Someone with Fi, by contrast, can easily be empathetic but in a different way. Relating to others through Fi is more about reaching out to each individual, rather than the collective. And while it may be a narrower focus, it is made up for in depth. My ENFP is very empathetic, it's just less about the direct expression of emotion by either party and more about deeply feeling what the other is going through, by reflecting internally on what that would be like. She can feel worse about a situation I'm in than I do, and I think that's partially because I have feeling so low on my function order and because it's extraverted, so I am quite clueless when it comes to my own emotions. It's perhaps not as much feeling directly what someone else is feeling, but more feeling what one would feel in the same situation; I think both are very much definitive of empathy.