Nvidia would be idiots to have a £650 card completely ruin what left of the 2080ti sales. I'm just not seeing it I think this is going to be a case where on paper doesn't tell the whole story but if I'm wrong, no bother I'll just grab the 3080 anyway haha. I'll prob have to upgaode my board and processor too, I've rinced this processor and it's been stupid value so hoping I'd get away with it for a little while.
Digital foundry got a hands on in a number of modern games both with and without RTX features and in most games the 3080 was 70-80% better at 4k than the 2080. At the lowest it was 60% better. 2080ti has nowhere near that kind of lead over the 2080. I see no real reason to doubt it.