glassmtn, I hope this information is still relevant.
My Mühle 35 K 252 Silvertip Fibre XL knot measures about 49–50 mm at its widest, after having used it and letting it dry. Since it’s a synthetic, there really isn’t a notable difference in the bloom, whether the brush is dry or wet. The only time it’s different is if it has been stored in its cardboard tube for a time.
I really enjoy the brush a lot, it’s definitely among my favorites, and the Silvertip Fibres are unlike any other bristles I have used. They seem to have the perfect balance of softness with just a bit of scrub. The only thing I would worry about with the Mühle XL is that the loft is quite high, so it may or may not work as well as a boar in attacking hard soaps. I don’t have experience with the L size, though I’d be curious to try one. The loft on that one may be better for hard soaps, perhaps. (I’ve never had any issues with the XL, but I use mainly soft soaps and creams.)
The Edwin Jagger brushes seem to have a slightly lower loft, if I recall correctly. They are also a little more affordable than the Mühle equivalents. I hope this is of some help! I truly am a fan of the Silvertip Fibre, and hope to add an L to my collection at some point, just to be able to compare with the XL.
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Whenever I go to shave, I assume there’s someone else on the planet shaving, so I say “I’m gonna go shave, too.”
– Mitch Hedberg