Canon has apparently calibrated this printer with a custom built target of 69,000 patches. I would have imagined there would be limited gain after 3000 patches or so, but we will see.
The increase of gamut with the extra 3 colours over the Epson has not been reported to be very significant, but I await exact 3D plots. Linearity will be very important for high end users.
So will handling and performance with non-Canon media . I would like to see someone coming up with a pre head vacuuming of paper to reduce clogging from loose bits of cotton (or wood !) that both come with rolls and packed sheets and is produced within printers by the cutter. Nash Editions did this with the old Iris' years ago. There are a lot of nozzles in this new monster.
Epson , I note, is spending a lot on advertising, so things are hotting up at long last.
Bring on the lions!