Javed, here's my favourite picture of a Sphynx cat. Dekhe mine hoi khub raagi. Given that they lack much in the way of body hair, including whiskers (which are important sensory organs for cats), a raagi temperament would not be surprising. But I've played with several, and they are extremely social and friendly cats.
Zinat, they are a breed created recently from some hairless mutations that show up occasionally.