The reader was recently updated with a new downscaling feature for non-mobile devices with the goal of reducing pattern artifacting that you would otherwise get. It works well for that purpose, but the downside is that the images do end up looking a bit blurrier.
Here is an example of old & new downscaling - as you can see that while the left looks sharper, some ugly patterns have formed in the grey areas.
If you still prefer the left over the right, however, we will be soon adding an option that allows you to choose which method you prefer to use for downscaling.