That's good to hear about the colour consistency. I haven't heard of any specific complaints about it but the introduction of the calibration unit in the x100 series makes me think -- is it just a marketing point against the HP aps? Or is it a needed improvement?
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No marketing hype. A very significant improvement in that it allows different printers to be calibrated to the same base point, thus making profiles from 1 printer perform almost equally well on other printers.
HP went a couple of steps further, they calibrate to each individual paper, not just the printer, as well as allowing the printer to profile the paper. Personally I think that was overkill, but then I've been making my own profiles for years and am comfortable with it.
Epson chooses to use a different head technology which allows their printers to be calibrated at manufacturing. Because there is very little wear on the nozzles, and the printer doesn't have to remap to spare nozzles when one clogs, this delivers a similar consistency between printers. (I'm not saying this is better, we all know the challenges that clogged heads on Epsons can present. This is strictly about their approach to deliver consistencyfrom printer to printer)
As far as Canon, I believe it was very important. A paper manufacturer skilled at making good profiles can produce x100 profiles that will probably deliver as good if not better results than the in-printer profiling of the HP. At this point, both Epson and Canon (and HP for that matter) are delivering printers that are very consistent. As long as the paper manufacturers choose to support the x100 series Canons as well as they currently support the Epsons, the need for "in printer" profiling is really not that important because of the new calibration routines. Agreed, some paper manufacturers are terrible or don't care about profiles, and it remains to be seen if the x100 series will get enough market penetration to interest any of them enough to even make profiles. For those that use a lot of niche papers without profiles available, a simple EyeOne profiling solutioin will deliver the same results as HP's in printer profiling. Perhaps not quite as easily, but it also works for your monitor, other printers, and even the replacement HP that is most likely in the works now - unless they make you buy it with another eyeOne built in.
I've been using Epsons for many years, and tried the z3100 for about a month. While is a very good printer, I didn't feel it really offered me anything, but I don't need to do any black switching on my 9800.
I've had a Canon ipf6100 for about 6 weeks now, and while it does present a few challenges from a user perspective, I don't think any are to the point I would discourage anyone from purchasing this printer, especially with the wealth of information from the 5000 wiki and other resources. As far as print quality, it is very bit as good, and perhaps even slightly better than my 9800. I have found a few very unique yellows from printing fall aspen trees that the 9800 seems to be unable to print that look great on the 6100. Interestingly enough, they also look great on my Epson 3800, and I can't find any visible difference in output of the 3800 and the ipf6100 ... almost a perfect match on every print I've tried.
Based on your initial post my recommendation would be based on one question ... how often do you need to switch blacks? If the answer is never, or hardly ever, then either printer will deliver outstanding results. Epson perhaps has a slight edge only because I like their paper feed system better than Canons on the larger printers.
If you need both blacks, then I would recommend the 8100.
Now that the official announcement is out, I suppose cost differences may also come into play, as it looks like the Canon is $1,000 more than the Epson. Also looks like you may be able to get one sooner than 3 months, supposedly shipping next month.