If I were a Billionaire, I probably wouldn't be any happier or live a significantly different lifestyle.
Sure, I'd drive a newer car, but is that really significant to my life?
Food, not sure how bacon, pork sausages, muffins, marmite, ham, roast pork, Zinger burgers, English pancakes, baked potato and chilli, chicken Jalfrezi and naan bread would be any higher quality if I had more money. Even a breakfast of moo ping and sticky rice (30bht) is pretty good.