Not sure about masterpiece but I like it a lot and appreciate the way it grew steadily in my estimation, in fact still is. There's a richness to it, with lots of layers and textures and stuff it gives up gradually. I like when an album does that in these days of instant gratification. In that sense it sounds like an album that took years to make.
It's too much to hope the new one will be twice as good but whatever the case, it'll be interesting.
That sums it up nicely!
I also think a new album is coming this year