Empathy – the final frontier between Natural and Artificial Intelligence?

Functions of left half of the human brain had inspired early work in Artificial Intelligence (AI). Since then, simulating emotions in machines has transcended science fiction and machine reacting with anger and sadness at an appropriate moment is passé. Google Now assistant was in the news recently for expressing "deepest sympathy to you, your mum and the whole family" to a user for his father's death a year ago and Apple's Siri has become a therapist. Today, facial recognition is empowering machines to go beyond Natural Language Processing (NLP) and recognize non-verbal communication such as fear, guilt and discontent through analysing visual micro-expressions. So, what differentiates humans from machines and is "singularity" here?