Inkjet, C-print (Fuji Ca or Kodak endura), Cibachrome all the same image created by an expert and I'm buying.
Inkjet gets bounced from the running 1st -- it lacks the colour gamut, and intensity (especially in blacks reds and yellows).
The c-print and the ciba might be a tough call. If the c-print was on a flex material I might pick it. Great detail, wider latitude, wider gamut, but less intense colour and it would look like a ciba. If the C-print was on an matte or satin I would probably pick the ciba. The difference between these is a taste thing.
I have compared the three and continue to compare c-prints in all their forms with high end inkjets in its many variations. Inkjets are a good commercial tool, and it is wonderful to get a quality image on a nearly limitless variety of materials, but it is still a bit short.
The credibility of the claims made by the producers of inks as well as those of Wilhelm are thin. I have printed 100's of inkjet with UV/pigmented inks for backlit display, many 100's more for window display and many many 100's if not thousands for interior display. The manufacture gives them anywhere from 5 years to 150 depending on lamination and exposure. We Will guarantee them form a 1 to 20, based upon non-anecdotal evidence, experience and depending upon exposure and laminate.
Is the art buyer full of sh!t? Could be -- my eyes are brown. The proof of the pudding, when it comes to a 'print', is in the viewing.
Unless you are taking advantage of an inkjets strengths it fails at one to one comparisons.