That's why a retina display ipad is now my preferred reader.

Yeah, I have a nice Galaxy tab for a mix of art and ebook reading.

I slightly prefer physical books and still collect them, but a tablet lets carry dozens on the road

Yeah, I've owned a e-paper Kindle for a decade but probably never finished reading a book on it. Instead I use a iPad 11 or mini, which are superior in every way (that I care about) except reading in sunshine. I love how lightweight the Kindle is, but not its small reading area or lack of color or weak illumination. Or its inability to serve any task other than reading ebooks.

I discovered that, although one really doesn't see the difference between a lower res display and a retina res display, it is just more pleasant to read the retina display.