So I decided to compare the EF nibs I possess right now, with inks on hand, since I got a replacement Lamy EF nib. I wrote out both Japanese vertically and horizontally, and English, to compare alphabet and oriental script.
Here are the combinations:
MontBlanc Meisterstuck LeGrand, 14K EF nib, with Pelikan 4001 Royal Blue
Lamy Safari EF nib with Lamy Blue
Platinum Plaisir with J Herbin Encre Violette
Platinum Preppy with Platinum Black
Vertical Verdict: Platinum Plaisir wrote the smoothest, then Preppy, and the grand loser was MB. Lamy did fine, but not spectacularly. MB was VERY scratchy. Also, the MB width is so thicker than the other three that it looks like a medium. What gives?!
Order: Plaisir, Preppy, Lamy, MB.
Horizontal verdict: Platinum Plaisir wins again. Preppy lost out to Lamy; MB is a little smoother, but still scratchy. MB must hate this paper.
Order: Plaisir, Lamy, Preppy, MB.
English: MB wins, hands down, despite the "this is so not EF" thickness, then Plaisir, then Lamy, and Preppy decided to scratch.
Order: MB, Plaisir, Lamy, Preppy.
Conclusion: Lamy can do fine vertically and horizontally, but fares better with loops and curves. MontBlanc abhors vertical strokes and corners, period. Plaisir is smooth both ways, but loses an oomph when writing in English, and tends to glide too much. Preppy is acceptable in all situations, but will never, ever stand out. Considering that Japanese has a lot of vertical and horizontal strokes, as well as angles, and significantly less loops than English, it makes sense for Platinum to make pens suited for that purpose, rather than Lamy or MB making nibs that suite cursive loops more. Also, thinner the nib, easier to write Japanese, because we have sudden upward strokes.
The red? Pilot VRAZOR EF point. The pink is Varsity (nib is bent for some reason).