What does the 2017 vs 2019 one look like now?
Irrelevant.
It's normally a four year cycle, so we aren't in 2017, but we might be rhyming with 2015...
Not now rhyming with 2015. That one has been broken.
It might be good news, but as I said before a few months ago, a too-strong rally at this stage might be bad news for the future. The reason is that exponential rises always trap a lot of late buyers at various levels on the way up, and it often means they are shaken out over a long bear phase. The shape of the chart puts new interim lows back on the map , and could delay any future ATH by some time.