Alright, so here's the scoop. I have the largest size (12.7ish?) iPad pro along with the apple pencil. I bought it with the intention of using as a portfolio device for client meetings as well as for electronic contract signing and light mobile photo editing.
I'm an adobe CC member and do 99% of my editing in LR CC on my Mac Desktop. I've made several attempts at editing while at work using the iPad, and it's left me wanting a macbook pro.. so much so that I'm considering selling the iPad.
Problems with editing on iPad:
1.) Limited export options - No way to export RAW files as a full size jpg, the max available size is 6000x4000, but compressed down to 1-3mb or so, so far from the top quality 8-15mb .jpg files I'm exporting on my desktop
2.) No good batch editing method - Even trying to simply adjust and exposure and do some crops from a sporting event, it's just too clunky and difficult to do things in LR CC for iPad. I've yet to find a good way to "sync" settings among a large group of images.
3.) Poor apple pencil integration - simply put, it feels more intuitive to use your fingers to do things. Local adjustments aren't nearly precise enough to make use of the apple pencil.
4.) Importing and editing RAW files on my iPad quickly depletes the battery, and several times it's died in the process... often resulting in a loss of a large part of my progress.
There may be more issues that I'm forgetting, but those are the big ones.
That being said, for portrait display and contract signing I've found it to be incredible. But it's expensive for just those purposes.
As a general media consumption device for videos, music, web browsing, etc, I've found that it's VERY good. But no better than say, a macbook pro, which could be had for only a few hundred more dollars.
I'll likely sell the iPad and upgrade to a macbook pro when funds allow.