I haven't but I still prefer other airlines due to their extremely inconsistent service levels on long haul flights (and they seem to be getting worse) and very inconvenient flight times on their CPT - FRA route.

The cherry on top of the cake was a couple of month ago where the 4 to 5 year old daughter of the purserette was climbing all over rows 1 and 2 and the respective passengers on a ZRH - JNB flight. Staff (and the mother) could not be bothered at all.