I don't use medium format digital cameras so can't answer specifically to that use.
I use an iPad Pro 9.7" as my general purpose travel computer and for casual photographic work on the road. It has 256G storage, which means I have space for at least 2000 full rez JPEG+raw captures with the 24Mpixel Leica SL or M-P240. With either I use the Lightning to SD Card Adapter to move JPEG+raw files to the iPad, and I keep the Lightning to USB Adapter in my bag as well for quick*photo transfers from my iPhone. With the SL, I also use the Leica SL app for wireless tethered shooting (and casual image transfer, JPEG only).
For raw processing, I use the PhotoRAW app. It's handled DNG and every native raw file I have at my disposal to test it with. For finish image processing, I use SnapSeed, Photogene, and the standard Photos apps. They all work well and have different features.
Coupled with the other apps I have on board, I can take exposures from capture, through rendering, and directly into slide show and book presentation formats right on board the iPad. It's light, small, fast, and does a great job.
For MFD use, the questions are "what is the MFD storage medium and how to move the files into the iPad?", and then "what apps can work with the file formats required?" A card reader with CF cards connected to USB or SD cards would be easy, and there are apps that can access and move files from such readers even if they're not recognized by any of the standard software. Which apps can be used with them is the probably more problematic issue: I'd talk to the vendors of PhotoRAW, Photogene, and PiRAWhna apps to see if they can offer compatible file processing.
G
-- Please don't be silly about the name "iPad Pro". It's an iPad, uses the same OS as all other iPads and iPhones. Pro simply says it's a higher performance model in the range. The iPad Pro 9.7 that I'm using will do raw conversion of 30 24Mpixel Leica SL files in about 4 minutes—that's about five times faster than the latest iPad Air or iPad mini that I've compared it against. It has a faster processor and more RAM to work with which nets this speed improvement, that's all. --