In my opinion, the remarkable thing about the MC2000 is that it does use an aluminum cantilever and a line contact stylus. Neither is really very exotic. Yet the sound is sublime in either of my two audio systems. This is evidence that one ought not to judge a cartridge a priori based on the materials of which it is made.
Chakster, You wrote, "The question is who is your supplier, you can buy NOS MC2000 only from
serious collectors of vintage high-end, and they can honestly describe
the condition. My NOS sample is absolutely perfect and fully original, I
am so happy to have it in my collection of the best LOMC. Never seen a
NOS sample for sale, only hardly used or damaged samples." But you MUST have seen an NOS sample for sale at least once; otherwise you wouldn't own one. My advice is, if you have not already done so, see how it mates with your 4212 current-drive phono stage and report back. It's not going to give you any of the pleasure of which it is capable while sitting in its OEM box.