I think I'd be at the "bragging rights only" territory if I tried out G.Fast at 160Mbps
But I don't think the real, immediate benefit of fibre is the speed. It is the lack of there being a distance limitation (well, maybe 20-30km), and a lack of need for DLM.
Back when broadband first started, the extra speed was nice, but the game-changing difference was the "always on" nature. The fact it didn't block the phone line.