I'm also after a slicer/carving knife, I haven't narrowed it to any particular brand although, MCUSTA, Blazen and Masamoto have all taken my interest. Liked the balance and FF of the UX-10, but not its edge retention so perhaps something that ticks those boxes, but is a laser.
A few excellent laser sujis (in alphabetical order): Gesshin Ginga in White No. 2, or stainless; Konosuke HD (semi-stainless), HH (stainless) or White #2 (carbon); Sakai Yusuke in "extra hard stainless" or White #2; and Ikkanshi Tadatsuna in Inox (G3 stainless) or White #2.
If you like that sort of thing, you might also want to consider a Takeda (san-mai with an AS core).
The Gesshins are available through JKI; the Konosukes through CKtG, the Sakai Yusukes through CKtG and Blueway Japan; the Tadatsunas through A-Frames Tokyo (actually located in Hawaii); and the Takedas through CKtG or directly from Takeda in Japan.
I have a 300mm Konosuke HD and recommend it very highly.
Rust eraser is your friend with high carbon.
Rust eraser is good stuff, so is baking soda, so are a few other things. For my carbons I use baking soda on a Scotch Brite everytime I sharpen or whenever I see a stain. The finish is a dull, silver glow -- just like any well maintained steel tool. It's not a patina, but not not a patina either.
The term "high carbon" as used here is something of a misnomer.
"Carbon" without any modification refers to alloys which do not qualify as stainless or semi-stainless. Most of the stain resistant alloys contain at least some chromium. By definition "stainless steel" must contain at least 13% chromium.
"High carbon" is steel industry jargon referring to any steel alloy, whether stainless, semi-stainless or "carbon," with at least 0.50% carbon by weight; or, in Germany, with at least 0.45% carbon by weight.