I just downloaded the trial version of Affinity Photo v 1.4, and it's absolutely spectacular. Just one aesthetic point - the circle cursor that appears when I select a brush tool is pixellated and fuzzy, the way some apps that don't work with the Retina display look.
I'd attach a screen shot, but it doesn't seem to capture the cursor.
I have an early-2013 MBP 15" w/retina display, running OSX 10.11.4. Does anyone else see this?