A 5090 is more than twice as expensive as a 1080 Ti in real MSRP terms and way more than that in actual real terms, since the 1080 Ti was available for some time below MSRP, while the 5090 realistically never was and usually goes for 50-100% above MSRP. So I don't think these can be compared. Basically a similar story with the 5080, it's significantly more expensive in real terms (and about ~2x in nominal terms).

The 5070 Ti would be the same spot.

If you compare these - the RTX 50 card has a bit higher TDP (which it will usually not reach due to clock limits), is a roughly 100mm² smaller die with around 4x the transistors and about 3x the compute (since much more of the chip is disabled compared to the 1080 Ti's chip). It has 5 GB more memory (11->16) and a lot more bandwidth.