I'm on a 2080 or 2090 (I forget which). I thought I'd upgrade to the 40xx now that 5090s are out. I looked at the prices and absolutely not. The 5090s are around 500k JPY, and ordering from the US would work out to about the same with exchange, tax, and any possible tariff that exists this week. Salaries here are also much lower than in the west as well on average even for those of us in software.
4070s are still around 100k which is cheaper than last time I looked at 250k ish.
Price aggregator site in Japan if you want to play around: https://kakaku.com/pc/videocard/itemlist.aspx?pdf_Spec103=500 On the left, you'll see the cards to select and the prices are obvious on the screen.