Based on RTX 4080 to better performance than RTX 3090, I guess RTX 5080 will also beat RTX 4090.

 I'd expect RTX 5080 will have a 15-25% performance uplift over the RTX 4080.

Until Nvidia officially announces the RTX 5080 or any other future GPUs, it is impossible to speculate on their performance compared to the RTX 4090. Typically, new generations of GPUs offer improved performance, efficiency, and features, but the extent of these improvements can only be determined once the product is released and benchmarked.

Given typical generational performance gains, the RTX 5080 likely will beat the current flagship RTX 4090 in some ways, though maybe not in all aspects.

But price for RTX 4090 will be dropped when RTX 5080 released.