Re: Whilst I'm no fan of Microsoft..
"Google Docs' best feature is the ability for people to edit a document together in real-time."
MS Office supports that too. You stick your documents onto on-premise Sharepoint / or via Office online. So no different in concept from having to edit them in Google's cloud, except that you also have an on-premise option.
"The best bit of Gsuite is the calendar. Being able to have a work calendar, a personal one, plus my wife's all visible on my phone"
Outlook supports accessing multiple calendars and has done for years. l have several visible on my phone.