I will be flying ATL-JNB-NBO early next month. I've seen several posts discussing C class service, but nothing recent on F class. Does anyone have experience flying F class? I have noticed a couple of seat charts for SAA's 747-400 showing 12 seats and 14 seats in 1st. Has/Is SAA upgrading their fleet? (I'm using DL FF miles for the trip)

Thanks for your response,
Steve