Re: Another major difference -
Most Canon software doesn't work yet on Sierra. Canon reported that most of its printers, scanners and camera utilities have issues with Sierra, and recommend to delay the upgrade until a fix is available. See http://www.canon-europe.com/support/consumer_products/operating_system_information/?=j+e
Hint for the CUPS fans: when you buy a €3000 printer, you expect to use it within its full capabilities, usually delivered through the specific driver and software.