Sonia G The Keyaki Brush Set is a limited edition brush that retails for $125.00.
Sonia G The Keyaki Brush Set Holiday Brush Set ($125.00) is a new, limited edition brush set that includes two new, exclusive face brushes and three eye brushes (that have been released previously but are undyed saikoho goat hair in this set). They feature shorter handles that are made out of Keyaki Zelkova Serrata, which is a native wood from Japan. By opting for undyed saikoho goat, the eye brushes are intended for both powder and cream-based product usage.
The shorter handles also seemed quite a bit lighter to me when holding them, so they may be good for someone who prefers shorter handles and doesn't want extra heft. I have longer fingers and larger hands, so I found that I preferred the longer handle length of the original Sky series brushes (eye brushes). The brush heads themselves are of the quality I'd expect from the brand -- they pretty much do what they're intended to do, are well-bundled, are soft but serve their intended purposes, and seem well-made. For reference, total brush length was just under 130mm (they varied by a few mm based on brush head).
If you're interested in the brushes from a craftsmanship/artisan level, you'll want to read the brand's post detailing the process and concept of the set. Part of the appeal is the artisan nature of the handles, so it may be of interest.
I have not experienced any issues with the Sonia G. brushes I've had thus far, and I've switched over to heavily using the brand's brushes over many of the other brushes I have or doubled (or quadruped) up on favorites. I have not experienced any noticeable wear (e.g. ferrule loosening, bristles getting splayed out of shape, or difference in softness/denseness).
The brush set launches today at 10AM PT, and as it is limited edition, I wanted to provide some photos and preliminary thoughts, but please keep in mind that I've only had the brushes for a few days, not weeks or years.