http://www.hakuhodousa.com/shop/index.php?main_page=index&cPath=1_3
From what I understand, this is the company that used to make MAC brushes and other brands brushes as well. Their brushes are supposed to be beyond soft. They have other great quality brushes, but the S100 Series Vermilion brushes are their top of the line. The ferrules are 24-karat gold plated brass and the brush hair is hand cut. I also read somewhere that the company founder originally made this line of brushes for his wife. I thought that was a very sweet story. You can find videos about them on YouTube.
They also have two sets you can get.
5 Brush Set: http://www.hakuhodousa.com/shop/index.php?main_page=product_info&cPath=1_9&products_id=241
8 Brush Set: http://www.hakuhodousa.com/shop/index.php?main_page=product_info&cPath=1_9&products_id=242