“While we’re on the topic, I have some things I want to ask you too.”
“Such as?”
“Between Ginkaku Uneri and Hakuhei Sabi, who’s stronger?”
“Having never met Uneri in person, that’s hard for me to say… but I would put my money on Sabi. His skill is unfathomable.[54] His ability to fight without damaging a sword is nonpareil – no other swordsman could handle the Whisper. For him, a stunt like cutting down a hundred men is easy-peasy.”

[54] 底が知れぬ SOKO GA SHIRENU “can’t see the bottom”

Katanagatari Omnibus 1, Page 141