The Radeon RX 6800 XT is not out yet, but one card is already being benchmarked in China. Put through its paces in 3DMark Time Spy Extreme, the RX 6800 XT comes close to equalling the performance of NVIDIA's RTX 3080.
https://www.notebookcheck.net/The-AMD-Radeon-RX-6800-XT-takes-on-the-NVIDIA-GeForce-RTX-3080-in-3DMark-Time-Spy-Extreme-benchmark-result.502206.0.html