5mbps is high in my book, i used to download 1080p stuff and games on an adsl network and trust me I WISHED that shit could reach 5mbps ! Most of my pirate life i'd have miraculous spikes at 1mbps and i still always went for 1080p stuff or if I can't find it in that quality 720. To me when i watch something i want to enjoy it to the fullest so i don't even bother with lower quality, i don't have 4k hardware so i don't bother with that.
(I've enjoyed fiber connection for a year or two and i always get surprised by the speed of it lmao)