The comparison between steel and gold nibs always makes me smile. The gold value of an average Pelikan 14k nib is around 8 (or was about three years ago). The Lamy gold nib would be less as it is so much smaller. However the gold value in comparison to the total cost of the pen is tiny, it is how it writes that matters, and the steel nibs are excellent. I have a Lamy 2000 and several M400/200s, the M400 is my favourite pen but the Lamy is pretty good too. Not quite sure I understand your comments about the Pelikan threads?
True, but gold nibbed pens on average cost more than steel ones. Im not too bothered by it either way, just wanted to include that aspect.
The threads, at least on my M400s, dont tighten securely until you torque them so much they grip into the plastic a little bit. This is a problem with all Pelikans, but the mechanical feedback on M20x and M40x is significantly worse than on M80x, for example. Have you tried the thread on Platinum 3776? That is an extremely satisfying feedback, you know exactly when the thread is tightened enough not to give, and it doesnt scratch up your barrel.