Ah yeah you're right, just looked up the 4090 numbers at the same settings and yeah - so the 5080 is 18% faster than 4080 but still 22% slower than the 4090, roughly in the middle of the 4080 and 4090.
The 4090 still has more VRAM though, for what it's worth to anyone.
The 5080 is going to be a good GPU, just not as good as previous gen uplift.