I just bought the latest Ipad Pro - the 9.7" version that has the super screen and 'True Tone' capability.
After my initial playing around with it I'm rather disappointed given all the hype that Apple made about it being a laptop replacement. I could well be missing something but here's my initial observations:
1- the standard way of getting photos on to the device is by syncing via iTunes. However:
a) you need the latest version of iTunes to sync with the iPad Pro and it turns out this version of Itunes has a bug whereby it doesn't like some photos for some reason (some new Apple curatorial AI?) and then decides to not sync any other photos it comes across thereafter - silently, without any error message. Deleting the offending images is the only way to get the remaining images onto the iPad. Apple appear to know about the bug and so hopefully in the near future this will be fixed;
b) iTunes re-sizes the images. For example, I have an image that is 5644 x 6679 on my Macbook. But when synced to my iPad, it becomes 3,460 x 4096. Presumably quality is also degraded as the image would have to be uncompressed and then recompressed.
2- I found one app., PhotoMgrPro that can import photos itself from iTunes. It pulls from iTunes rather than the standard iTunes push and so I can import images in their original size. Hurray! However... the standard maximum zooming in iOS seems to be fixed. The result is that in the standard iOS Photo app and also PhotoMgrPro, I can't zoom in enough... Effectively back to where I started.
Importing and zooming issues are the same for Snapseed.
So basically, I can't get a 100% enlargement of my photos.
3- I tried Lightroom Mobile. (Note that there are two version of this app.: one for a phone and one for an iPad; the latter is the only one that can make use of the large iPad screen though the former still works.
Lightroom doesn't cap the zoom amount. Great! However... to import the images you must import them from the Photo app which itself gets them from an iTunes sync. So great that you can zoom in, not so great that you can only zoom into a lower res image.
It appears though that if you subscribe to Lightroom CC - and it seems that the standalone won't do - then you can import images from your main computer - presumably at their original resolutions.
I don't know if LR Mobile will allow me to import from a memory stick and even if it did, I would then have to pay for a fancy new cable / stick for that.
I don't want to pay for a Adobe CC subscription just to be able to view my photos at 100% crop on my iPad.
I've seen someone on this forum praise the Filterstorm app. but from their website it looks like you can only import images from the iOS Photo app. Also, I can't see whether zooming is capped or not.
4- The Ipad has a 'True Tone' capability which adjusts the screen's white balance according to ambient light conditions. Personally, I've found that this has a negative impact. Perhaps it's because I bought the iPad with a black bezel. I assume that a True Tone would be needed if one had a white bezel so that the screen matched the changing whiteness of the bezel.
5- The screen has a best of class, low level of reflectivity, which is great, but it also means that it is the worst for picking up - and keeping - greasy finger marks. My iPhone 6 wipes clean more easily.
So, so far at least, I find the iPad a bit of a toy but I still hope to find a reasonably priced app. that at least allows me to see my photos at 100% crop at their original resolution.