I have indeed done a lot of reading and talked with several techs and two dealers in my area. Canon is definitely coming out ahead based not only what I use the printer for (weddings, portraits, fine art) but also because of image quality and usability. Canon has apparently just worked exceptionally hard at making a better machine than Epson.
Really? Image quality? You can argue features all you want, and if you need the roll feed of a 6300 or the width or the speed, or just don't want to spring for the Epson (big rebates right now), fine. They're both good machines and image quality is not a factor in the decision - if you aren't getting completely fantastic prints out of your 3880 you won't get any better prints out of the Canon ...in fact they will look pretty much identical 99% of the time. You are asking for opinions in a world where there are no objective opinions, add to that asking dealers and techs who may know how to get the machines to print, but do they really know how to print? You don't think they are completely biesed, just like everyone else, based on what they like (or what they make the most money selling). And why in the world would you base any decision like this on a meaningless poll? If Canon is leading, it's simply more Canon users voted, or many like myself that don't bother voting in stuff like this. And of course, your first post is a question that has been hashed to death so many times on this forum. A few searches and you would understand why you look like a troll ... 1st time poster asking a question that has been beat to death for several years now ...
From an image quality difference Canon is not better
. An ipf6300 vs a 3880 very close, but don't let the slightly larger gamut of the canon mislead you ... that doesn't add much to image quality except a few rare images ... and in the case of flesh tones and smooth skin transitions in the hands a skilled user that 3880 will come out as good and often better than the Canon.
But don't try to "justify" a switch from an image quality perspective ...because that's not a factor. Unless you need a feature of the ipf6300, ditching your 3880 is a complete waste of money.