Is it worth it to upgrade to the XPS 15 7590 over the 9570?

[Windows Central]

We've tested many iterations of the XPS 15 and the latest 7590 is gearing up to be quite the laptop. Deciding on whether you should upgrade from the older 9570 or choose the newer generation laptop may be slightly confusing at first.
[h=3]Newest model[/h][h=4]Dell XPS 15 7590[/h]

From $1,100 at Dell

Full story from the WindowsCentral blog...