The other Vivera inks are dye, the Z and 9180 are pigments.
On printer gamut and depth. It's fairly easy to compare the Canon to the Z and the Epson K3 printers. I have no access to the next gen Epson so that is where I stand.
The K3 as expected doesn't reach out as far as the Canon or HP as it is a CMYK printer.
What is surprising is the K3 has quite good colour depth compared to HP or Canon.
The gamut on HP and Canon live in the upper areas very bright and very saturated considering they're pigments.
The HP is bigger in some areas, the Canon in another. Attention: the effects of having this larger gamut in the chosen areas will cost you a lot more than the colour gain in lightfast years. Also as Mark McCormick said on Dpreview catalytic degradation on these extra inks is not taken into account in the current WIR testing yet is something to be cautioned.
So the more we know about gamut, stability and permanence the better. HP made very deliberate decision to favour permanence over loss of fade resistance. You could say all the pigments are lighhtfast enough for museum. But give me a large gamut printer with extraordinary lightfastness and I can easily understand the intention of these printers.
The other thing that has to be seen is the Gloss Enhancer. When laying a 7800 print beside the Z3100 with GE it makes the gloss differential look cheap. The Z 's GE just simply works. It is either eco mode or whole page. Eco mode covers the solid and composites that cause gloss differential. The culprit in HP's inkset is lGrey, but could be different on Canon ( quite bad gloss dif. on satin and glossy IMO) although the Epson is tamed quite a bit compared to the Z or Canon when NOT using GE.
Ask away, whatever you like. If I can answer I will. I don't think there should be reviews yet as there are only protos here and there and a review of a proto....hmmm isn't correct to do.
Oh BTW I have run many papers through the Z . In that way it's a lot of fun> you add a custom media, calibrate it , then profile. HAve a break and it's ready to print calibrated and profiled, all menus populated with your favourite media. Nothin' like it.