This knife is, I believe exclusive, to Williams Sonoma the Zwilling J.A. Henckels Pro Chef's Knife.
Quote from the the Williams Sonoma page:
"The Zwilling Pro collection offers ultimate comfort, security and precision in the hand, thanks to a special arched bolster designed by architect Matteo Thun that promotes a perfect thumb grip. A contoured ergonomic handle enhances your comfort."
The only concern to me would be blade thickness.