I am a Systems Admin for a large retail chain. For those that say an iPad Pro can not be used for real work, you are not thinking outside the box! As I said in my earlier post in this thread, I use my iPad Pro for work more than my laptop.
All of my iPads have cellular service. I have the iPad Pro 12.9" I mentioned in my previous post in this thread, and I also have an iPad Mini 4. The iPad Pro is absolutely wonderful, but its size makes it hard to take everywhere I go. The mini is small enough to hold in hand, or even squeeze it into a pocket. (I am 6'6", so I am a big guy. It is a tight fit, but it fits.)
When in the office I use wifi, when out of the office I use Cellular and VPN. No matter where I am at, using remote tools, such as VNC and RDP I can login to my servers and have full control. The Microsoft RDP Client is the best one out there. It allows you to emulate full mouse control and the Apple Pencil gives precise mouse control, or use finger touch. With the large 12.9" Display, and the ability to zoom in and out, gives a good amount of real estate for seeing things.
Yes, the iPad is not powerful enough to do a lot of functions. But, my servers, my work desktop, RDS and VDI Sessions, Web Tools, etc, are. My iPad is just a thin client that allows me to access the more powerful devices and tools from anywhere.
Is an iPad good for all use cases? No, was never meant to be. That is why I also have a laptop. But, it handles a lot of them. Just need to think outside the box on how you use it.
Now, this thread is about iPad Pro 12.9" versus the new MacBook Pro. If I did not have an iPad Pro or my personal MacBook Pro and was in the market for a new device. Then I might be tempted to go ahead and get the new MacBook. And if I could only have one, then the MacBook Pro would be a No Brainer!!