Worth noting that TSMC is relentlessly incremental. While Intel wanted to make a bigger, slower jump from 14 to 10, TSMC did an N7, an N7+ (not to be confused with N7P), an N6, N5, and N5P, and later this year, N4 is on the roadmap.

So counting "generations" is a little abstract anyways. You should probably look at the PPA numbers and the kind of scaling boosters they've managed to ship, if you want to compare fairly.