It's certainly an area with more depth than I anticipated when I first started getting into it. Adobe is still pretty much the only one that can get a PDF compliant with print standards.
As far as I know, there's no way to currently get colors adhering to print color profiles in CMYK out of browsers.
Indeed, if color correctness isn't mission critical, I can imagine that going with Paged.js can be a nice experience!
(Edit: in my experience so far, it's been really really hard to 'correct' colors from an existing PDF in a way that gets a satisfying end result---the colors are usually muted/washed out)
