I'm using an rMBP and the XQuartz treatment of text on there is literally painful -- simultaneously blurred and pixellated if that makes any sense. This isn't the hedonic treadmill effect with regards to the retina display as I have no problems using other systems with "standard" displays.
I agree that the latest XQuartz update forced me to try out the native emacs-app which had nicely looking fonts. But I couldn't store my selection of a good font, and the overall experience was awful. My hand still hurts.
With the latest XQuartz and emacs 25 only "Use System Font" looks good, before we had much more good fonts. Wonder what caused this regression.
