I don't see the difference between a Semogue and an Omega boar. The handle makes a premium boar, not the hair.
True, but it's still the same type boar hair. With badgers you get different categories.It depends on what you consider premium on your face. Do you prefer a floppier, shorter loft and small knot brush? Or the opposite? In my experience, my 24mm knot, 55mm loft Zenith is the perfect size. Smaller knots were floppier and longer ones were too long. Apart from that, make sure the knot is densely packed. And then there is the bleached vs. unbleached choice, I'd vote for unbleached.
Wow! Those are beautiful!A couple of other boar brush makers that make nicer quality handles are Riva and Il Marchese - both from Italy. Riva sells their brushes through Etsy, and you can make custom orders. Il Marchese sells through their website.
Here’s a picture of my Riva aluminium handle boar, on the right (left is the Abbate Y La Mantia brush, which isn’t available currently but is also a nice quality handle). The Riva is a good handle to hold, and not overweight. Flash Gordon probably uses one of these. Most of Riva’s brishes are one-off designs made of stabilised woods and acrylics, but this aluminium one (which I like better) is always available.
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And here is a stock pic of an Il Marchese boar. They offer a couple of standard handle shapes, in black, dark green, red, light blue, and white. This is the larger handle and it is also offered with standard and lower loft knots. They also do swirly acrylic handles in a different shape, which isn’t as much my bag, but it might be yours. The acrylic feels much better quality than anything Omega or Zenith offer.
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The only boar with a nice quality handle from the main three manufacturers is the Semogue SOC in Taj or Butterscotch acrylic. Zeniths, even the more expensive acrylic handles, aren’t particularly good quality handle materials. And the Connaught Omega Jade handle is pretty mediocre quality too, to be honest.