There are lenses that are bought due to their place in history, being the first of a type, pushing bleeding-edge of technology, being unique, owned by a famous individual, other reasons than outright performance. The novelty of an item to make it collectible. The Leica 50/1.2 Noctilux hits most of the marks for being valuable to collectors. As far as optical performance- the Voigtlander 50/1.2 Nokton is superior.
I suspect in 20 years after production ceases, the LLL lenses will be valuable to collectors. Many of these low-production lenses with fast-aperture will go up in value. The 7artisans 50/1.1 is getting more attention now, that it is out of production. At under $400, fun to own and shoot with.
With a price of over $2K: The LLL 50/1.2 is more expensive than the 50/1 Nokton, and not as good optically. Some high-cost production techniques are required to produce the lens, so it is not over-priced. Just that improvements in optics and manufacturing techniques have been made in the last 60 years.
Am I tempted? It's not a Sonnar. I've dropped more in Sonnars in the last year than this lens cost. But with those- I convert them to LTM and can always get an immediate increase in value. I was informed that one of my lenses was sold in Europe for about the price of this one.
The Light Lens Lab 50mm f/1.2 ASPH. "1966" Lens is a recreation of the mythical and highly sought-after 50mm f/1.2 ASPH from 1966.
www.popflash.com
So- in the US, visit Popflash to reserve a copy. Figure about a year for shipment, as per Popflash. $500 deposit, and only a 5% cancellation fee on the deposit, $25 to change your mind.