Thanks - so far as I can see we already do "Case II" in the blog post about QT above:

matplotlib/lib/matplotlib/backends/backend_qt5.py

Lines 127 to 130 in 2125562

    
           if is_pyqt5(): 
        
               try: 
        
                   qApp.setAttribute(QtCore.Qt.AA_UseHighDpiPixmaps) 
        
                   qApp.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)

So its odd that its not working for Qt5, unless you have an old Qt5, an environment variable set, or are somehow disabling this. You could download master and put a print statement above to see if your Qt5 has the correct attribute.

Uh oh!

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