Because I was experiencing flow issues with the Whaleman's Sepia in my Plumix, I decided to put it in a Preppy 05 and use it for a week or so and see how it went. Note, in the scan the ink looks black but in real life it's more brownish. Love the color... but the flow is pretty bad. I'd only recommend it in very wet writers.
As per request, here is a small comparison of Noodler's Lexington Gray and Noodler's Manjiro Nakahama. Note: In my Plumix the Whaleman's Sepia seems dry, but it could just be the pen being fairly dry itself. I'll post an update when I try it in another pen. I should also note that the scan of Lexington Gray shows up darker than it really is. It's actually quite light, like the color of an H or 2H pencil.