Tommeyer, I would suggest to check if some of your friends, acquaintances or family does have an iPad and can borrow it to you for a week to do a side-by-side comparison.
Also, adding a non-glare screen protection foil can make a lot of difference here.
I have both a very old iPad 1st generation, and a new iPad Air 2, and find that they are both quite good for reading. Yes, my Kindle Paperwhite is better (especially in direct sunlight), but the drawbacks for annotating pdf's would IMO mainly be in the application that you use and the latency of the e-ink screen.
A word regarding memory - was mentioned in your first post - don't worry about that.
The reason why most people think they need 64 GB is because they like to have the last 2 seasons of Game of Thrones in high quality on their iPad just in case they get bored with annotating PDFs. You don't need nowhere near that much for PDFs.
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