I've used the z3100 to make prints of artwork for some pretty demanding fine artists. I consider the profiles made by the z to be "top notch" as my customers seem to be ecstatic with the quality of their prints...they are a spot on match to the paintings. As for my photographic prints my photo clients are not just happy with my prints, they are blown away.
There will always be the occasional image that one will have to tweak no matter how good the profile is. With the z, I have yet to encounter an image that I have had to tweak and reprint because the color did not match my monitor, although I'm sure I will at some point. BTW, I'm using the "regular" z3100 - not the APS model.
Can I ask you a few questions about your workflow?
Im also printing for a fine artist and use HP Hahnemuhle Texture Fine Art Paper, and we are thrilled with the matte finish, but my problem started when trying to do a red painting it came out signal orange. And when i look at the profiling testsheets all red are orange even on the Premium Photopaper.
Do you use printer or program color managment?
When printing in RGB ill set the proof setup to the paper (Tex art pap then use Preserve RGB numbers + Simulate Paper Color in CS2)and its ugly as hell but no matter how much red I put on it still get orange.
(I use WinXPPro SP2 and PS2)
I got closer yesterday when convert to CMYK and put on some saturation. But still alot of work and print to get it right.
Can you confirm that the cubetestpaper is orange and not red on matte paper for fine art?