Until we get a comparison between the Intel DG1, Nvidia GTX 1650 and AMD's Radeon RX 570, the comparison with the iGPus from laptop-grade processors will have to suffice. Of course the DG1 is dominating the graphics tests by a substantial margin, but the physics tests reveal quite a different story.
https://www.notebookcheck.net/Intel-Xe-DG1-discrete-GPU-performance-results-versus-upcoming-iGPUs-leak-on-3DMark.452932.0.html