I went in May/June 2016 and it was not but this can largely depend on the currency exchange. The South African rand is super volatile so depending on when you go, it can be more/less expensive. To give you a benchmark, for a week-long trip,
it was about $2000 for a 5-star trip, not including airfare in/out of the country but including domestic flights.
Over half that was spent on safari (this is a more expensive safari that was $300+ per person per night w/ double occupancy - you can definitely find cheaper camps). Accommodation and food in Joburg and Cape Town were very affordable.
VG