We were doing AI art Turing tests with SD 1.4

Most people got a little above average, but the artists tended to guess correctly the human artists and miss some of the AI. It comes down to experience really, you can see brush techniques (especially digital brushes) and pick up on things like how some aspects of AI will be inconsistent in terms of skill level across the same image or how human art will take shortcuts reusing parts of the image. The test images were carefully picked so you couldn't determine it was AI by obviously bad anatomy, text etc