Good point. FWIW, I've had a horrid time getting decent readability with Windows {7 thru 8.1} on a Retina Macbook Pro (via either Boot Camp or Parallels). I've attributed most of that to legacy Windows apps, which seem to be a horror show in HiDPI mode. I eventually just had to set that VM to a much lower resolution to make the main app (CAD suite) usable there. It's almost shocking how much better OS X handled the low to high DPI transition than Windows has been able to manage.