I own the HD120 Petty <--link
, and can say that it is scalpel-like. It is very light, very thin & very capable of scalpel-like edges. It is a very shallow petty, as is the 150, that is similar to a steak knife, in profile. I do not care in the least for said design as a petty. I purchased my 120 as a parer, but had found it too large for my originally intended application though I do like it to turn large artichokes. I only pull it out for small fruit work though it gets used for more once it's out. It is a very precise tool; too precise for my liking in a utility knife. I prefer a 150mm w/some height as a petty, like the KanehiroG3<--link
, but that depends on what you're looking for; a petty or a parer.