From what I've read the additional green and orange in the P9000 produces an additional 14% gamut over the P8000. However, on matte canvas it won't be noticeable. You will see it on gloss paper, but then again you will have to look closely. I don't print B/W so I can't help you there. Before I sold my 9900 I printed a canvas and then compared it to the new P10000 and there was not that much difference. The blacks on the P10000 are more robust and I had to make changes in Photoshop to lighten the image to bring more detail out in the shadows. When I get the full feel of the printer, I will do a write up here. So far, I am very happy with the purchase. It is fast, fast fast. Yes, it cost $2000 more than the P9000 $3,000 more than the P8000, but for me it is worth it. I will keep this printer for 7 years and it will pay for itself many, many times over.
And thanks to Tony and Wayne at Tastar Data here in Pittsburgh for bringing the new printer into my storefront, unboxing it, and setting it up for me and giving me a great price. On the same day I sold my 9900 and it was a seamless transition.
Gar