Ok, this is coming from a guy who has owned the Z3200 44" and also the iPF8300......
I could never get a smooth gradient on my Z3200, and I tried the built in profiling as well as the Advanced Profiling Solution. This drove me nuts about the Z3200. I absolutely loved some things about the printer overall, like the gloss optimizer for glossy prints and the built-in spectro, but my intention for that printer was to only use it for B&W prints on glossy papers and it fell short of my expectations. The Z3200 is the only printer on the market that has a 3 controls over toning in the printer driver (shadows, mid tones and highlights), and this intrigued me. No matter what I did with the profiling I could never get a smooth gradient. I did do a 1728 patch profile outside of the printer, and it did better than the built-in spectro, but it still fell short of my expectations. The drawbacks to the printer are well documented here, such as the slow speed (I don't care, but others might), roll loading from the rear of the unit and not-so-robust quality of printer stand, etc.
On my 8300 it just goes and goes and goes and goes. I love the output quality and it is my go-to printer for all B&W as well as color. I had a 9900 but had some issues with it and decided to part ways with it. The 9900 quality of output is superb, but I had different needs at the time. I do switch out paper types many times throughout the day and I didn't like having to switch the blacks around each time. Waste of time and ink.