The "need for speed" and the doubling in price of the Noctilux was probably responsible for the Canon 50/0.95 and 50/1.2 skyrocketing. The RF coupled 50/0.95 with a Canon 7 body ran $600~$700 a few years (five years ago) ago. A TV lens version ran $200. The Canon 50/1.2 ran ~$250. With the availability of a $10,000 Noctilux alternative, prices went up. NOW with a $1,100 alternative: I cannot see a Canon 50/0.95 50/1.2 fetching more.
The change in the market situation over the last few years has changed so much as to make a over-time comparison irrelevant. The prices are what they are, now in the days of the $4000 + used Noctilux.
I can't see the Nokton causing a softening of the Canon 1.2 prices - with that approximate $800 difference (humm... CV 1.1, or Canon 1.2 AND CV35/1.2 for the M8??
😀) I agree with the previous comments that it could actually increase overall demand for fast lenses as images are posted (it looks very good so far, btw), and since the 1.2 is the most afordable option out there it could go up in price.
Something like the Hex 1.2 will probably stay close to where it is - at about a 60% or so premium, due to quality and rarity. The Hex 2.0 still carries a premium larger than that over the CV 1.5.
However, I do think the Canon 0.95 is most vulnerable to a drop. I am sure there are a lot of buyers looking for a faster than 1.2 lens and don't want to pay for a Noctilux. But, OTOH, if you have an appreciation for the images from an 0.95 (many certainly do not), the CV is probably not going to be a proper substitute.
So, I think now would be the time to buy a Canon 1.2 - just in case!
🙂