Can anyone share their opinions and compare Parker (vintage) Violet, Skrip Purple, and Pelikan Violet for me, please?

And the same for Skrip Turquoise, Parker (vintage) Turquoise, and any others?

Leads to other comparable colors in modern inks would be appreciated as well.

Thank you.

I can't compare the two, but for a suggestion on a nice violet ink, I really like the new MontBlanc Violet. It's a bluish violet, similar to an aubergine. Give it a try.

I'll answer the question the question the way I want and the way you did not ask. I have Waterman and Sheaffer inks in what I believe are all the modern colors. Eight each. I find both the purple and turquoise to be very similar. I'm certain they are different but I see little. I find the reds pretty close, but the blue, Blue-Black, green, brown and Black are different.

Check the Ink Review section there might be scans or reviews of the colors you are looking at.