This is a really good video about how Apple cares about being pixel perfect compared to Windows with something simple and obvious like the mouse cursor icon: https://www.youtube.com/watch?v=YThelfB2fvg The improvements he made are also quite nice, Microsoft should take note...
Still can't get over on Windows how 1 in 3 times when you move it to the edge of a window (might just be the lower left edge) the resize cursor appears gigantic and glitched out for a single frame.
Really don't understand how they either don't notice that stuff or just say "Yeah it's fine, just ship it". I know you can say "well it still works, it doesn't alter the functionality" but what if like every 3rd time you picked up a pencil I flashed a floodlight in your peripheral vision. Would probably push you out of your flow right?