Damn, that is a nice piece of glass.
On the opposite end, many years back I had a chance to play with Nikon's 8mm (i think?) fisheye. 220 degree view - actually saw behind itself.
Trippy.
I recall in the 80s, Leica was promoting their 300 2.8
$$$$$ - but every one included a higher end Volkswagen to cart it around. LOL. Nicest lens case I ever heard of.