I thought this was an excellent, informative review, but one thing in particular stood out:

I had to look back and forth from iPad Pro to my old Octa-Core Mac Pro in my office, which can’t even handle editing 4K in any way and realize what the iPad Pro represents in terms of technological performance leaps for something so portable. It really is a breakthrough.

The iPad Pro was given a clear directive, to push Apple’s ‘Post-PC’ initiative by offering a comparable level of performance to existing portable and desktop computers while capitalizing on all the advantages of being a mobile iOS device.

And if you have any doubts, the iPad Pro can indeed edit 4K video, albeit with a few creaks for longer video sizes.