To find 1038Be, look up in FB Marketplace and thank me.
I see 2 good ones in my area. I know a guy who just bought a lightly used 2nd hand set of Kanta 2 + Kanta center channel for $6k.
Regarding your 2nd question: I prefer the 1038Be for rooms larger than 18x18x9. The flax cone drivers of the Kanta 2 are, perhaps, a bit more natural and faster but are less punchy. The 1038Be go deeper. There is a reason why the Sopra 2 / Utopia have essentially the same drivers (rather than those made with flax). But, it is user preference.
I find the tweeters in the 1038Be to be very smooth and not harsh at all (unlike those in the 1037Be). But yes, Kanta 2 are a bit warmer. I use Parasound gear and 1038Be match very well with them.
In fact, I got to audition the 1038Be right next to the B&W 802D with same electronics at a dealer. I preferred the 1038Be (which is saying a lot as the 802D are great speakers).