Johnny V wrote:
I don't see how the output could get much better
Concur! Main thing for me is saying good riddance to ruddy metamerism.
I took two printouts of a test image from Digital Outback (based on the Bill Atkinson RGB image) to work. This image has a grey scale ramp, the four polychrome children's faces, etc. One of the prints was done on my previous 4000, using the original UltraChrome ink set. The other on the 3800, using the K3 ink set. In my cubicle, which is entirely lit by office fluorescents, the 4000 print shows a sickly purple-pink cast. It's not even subtle - the grey scale is more of a mauve scale. ;) - but its even more obvious when comparing it to the print from the 3800, which remains perfectly neutral. Yet take the same two prints over to a window and they magically become identical twins.
I'm also noticing improvement in deep shadow colour handling - black to near-black - plus, pure hues like yellow, red, blue, and green are definitely more saturated. Haven't really tested for this yet, but I think I'm seeing some of the benefit of the improved dither; some indication that one could print a given image maybe 10% or 15% larger before detail starts to break down.