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PocketBook Readers and Onyx Boox have Persistent Zoom- meaning you set the zoom level per book and it sticks as you turn pages. When last I checked Sony readers did not, so you had to re-zoom on each page turn.
Both companies also offer multiple zoom levels up to 400% and to height, to width, full page etc.
PocketBook also offers multiple column zoom. you select how many columns the PDF has and then the device will scroll through each column when you "turn the page".
Boox 60s wacom screen gives you fantastic control over panning- you just drag the document around the display.
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