So far the kindle oasis is the best ereader in term of hardware and ergonomy I've used and that's comparing to a kobo sage I also have and to all the ereaders I've had over the years (never had sony but I used to purposefully avoid amazon)
How on earth can it be best in terms of ergonomy if it isn't symmetrical and requires rotating it 180 degrees to change hands instead of just... passing it to the other hand?