So overall, the new 4080 16GB leak does bode well for the 4090. If the 4080 16GB is indeed 20% faster in Raster vs overclocked 3090 Ti, than the 4090 most likely be around 50-60% faster than 3090Ti as it has over 6000 more cuda cores than 4080 16GB.
By comparison, the 3090 over 2080 Ti was around 40% faster in Raster but what really made Ampere stick out was the 3080 being 30% faster than 2080 Ti while being $700 vs 4080 16GB being only 20% faster than 3090 Ti while costing $1200.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850