I'm hanging onto the new 10.5 and I will continue using the 12.9 at my job, which requires annotating PDFs outdoors while utilizing split screen. The 80/20 view on the 10.5 does not leave me with enough comfortable writing real estate for the forms I use, while the 12.9 does.
The 10.5 looks like it will be taking over daily use for media/news consumption, personal emailing (using the Apple Pencil this morning to sign new auto insurance forms) - I pretty much live out of hotel rooms and this thing will replace a TV for me in many cases. I don't have any plans to get rid of my Mini 4 but I can easily see it sliding solely into "gym bag for cardio machines" duty pretty quickly.
The 10.5 looks like it will be taking over daily use for media/news consumption, personal emailing (using the Apple Pencil this morning to sign new auto insurance forms) - I pretty much live out of hotel rooms and this thing will replace a TV for me in many cases. I don't have any plans to get rid of my Mini 4 but I can easily see it sliding solely into "gym bag for cardio machines" duty pretty quickly.