Seems like the Japanese also benchmarked Wan.
https://chimolog.co/bto-gpu-wan22-specs/
Keep in mind they are using Kijai because of using the EasyWan22 workflow so it is more Nvidia slanted than usual which affects the benchmarks. But even at "360p", it's brutal. 4090 vs 5090 is not a 2x difference. What was very interesting to me is that RAM was benchmarked and the sweet spot is 64GB.