I think the Epson printers with variable drop are very good at screening to albeit a lower bit depth. It will be nice to see what variable droplet size would be like with 16 bit screens.
Reliable rumor has been around for some months that there will be 16 bit Epson drivers. Exactly what that means and how it makes use of the data, and whether or not it results in actual 16 bit screens will probably remain proprietory. StudioPrint takes 16/channel in, who knows how it's used?
This is one of those issues that is hard to address, I suspect you will rarely if ever see a different on paper, until that magic alignment of the image, stars, and your mood, suddenly makes the difference appear.
I would think single channel (several B&W methods) would reveal a difference before color, where other channels/inks will mask an individual channels "problems".
Interestingly, IJC/OPM, an advanced B&W driver based on GIMP code, insists they take 16 bit in, and make use of it.
There seems to be little user talk about the Canon export module with this regard, that I have seen.