Andrew Boon
Starting from 7.3 you can upload a double sized logo through Settings > Basic Settings in your Admin panel.
paansystems
Can not find it, even on a clean install or upgraded from 7.2
AlexT
When you upload logo using resizing - it created 2 images for normal screen resolution and for retina screens. Without resizing - no retina image is created. Also image must be at least double of the desired size.
 
 
PET:0.069998025894165