FWIW, i know the president of swiss did take CX from manila to HK then LX back to ZRH. His wife n himself did not block the entire LX F.

Well... I dont think he did but maybe the entire cabin was his men- but it didnt seem so to me when looking at the manifest.

So, it DOES happen head of states take commercial flights on trips. considering how much of a controvesy it can bring up when they use state money to buy unnecessary seats.