Powder Metallurgy Showdown: Miyabi Birchwood (SG2) vs. Miyabi Black (ZDP-189)

Takefu SG2 at 63 HRC or Hitachi ZDP-189 at 66 HRC? We tested the Miyabi Birchwood against the flagship Miyabi Black across two months of kitchen prep, measuring real-world edge wear, BESS sharpness degradation, and whetstone response.