I hadn't read too much about G.fast, however the two tiers seem to be:
330Mbps down, 50Mbps upload
160Mbps down, 30Mbps upload
From looking at this blog here.
Which to be fair looks pretty good today. I think by the G.fast becomes a thing a lot of people can get, Virgin's lowest tier will probably be more than the highest currently available on G.fast though.
I would like to see FTTP companies like
Hyperoptic service more areas, that really is fiber to your house, no messing about trying to find new ways to keep copper wires about.