Richard, I'm not sure about the color gamut of Fuji Crystal Archive paper versus the Epson Ultrachrome inks, but I know they are very close, and that issue is not likely to matter anyway unless your prints contain extremely highly-saturated colors (if you are photographing neon signs for example); otherwise virtually any colors that you can photograph will fall within the gamut of both processes.
One benefit of using the Chromira is that the Type C prints are easier to mount. If you like face-mounting prints on plexi, then the Chromira is the way to go-- you can't do that with the Epson prints. I also heard that Fuji has just released a new updated version of Crystal Archive paper with a brighter white point and better neutral greys. I don't know how the new paper will stack up against the Epson papers; they are both so good these days that gorgeous prints can be made from either process.
One reason that I prefer the Epson is that I own one, so I can make my own proofs and prints; if someone else were making my prints, then I would consider the Chromira as just about equally attractive, with the one exception being that the Epson prints are slightly sharper.
I still think the graniness in your Epson print is caused by oversharpening. The Epson printer is sharp enough to render the tiny grains that are caused by oversharpening; the Chromira will render those same grains with some fuzz around them, making the print look smoother. So the file is oversharpened, and when you do a side-by-side, the oversharpening is visible on the Epson print and not on the Chromira. I'm printing a 6-foot-wide print on my Epson right now that has a pale grey sky that is so smooth that it looks like spilled milk on the paper; not a single pixel or dot or grain visible anywhere.
~cj
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