I have more daily experience with 17" printers rather then bigger ones.
Because of being non-heavy duty user I have chosen P800, and its earlier incarnation: 3880 (very minor clogging issues). It was to be Canon, but the Pro-1000 had increased problems with ink usage for maintenance (cases easily to find in the net). Canon makes firmware updates to solve the problem (maybe it has been solved yet), but dozen of updates does not sound good. The most weird thing is that in some cases there is no problem at all, but some other users report unreasonable ink loss. Hope Canon knows the reason.
This does not happen with Pro-2/4000. If you had Z3200 (I would dream to have one!), probably you were the most happy with its matt output. Canon should be more vivid on glossy media, while Epson somewhere in between HP and Canon. All are great printers and the rest is your own configuration of your requirements.