https://c1.staticflickr.com/3/2816/33775090465_8825e16fdb_c.jpg
You shouldn't be polishing either really,
but here is a used MITAKA vs a New WOSSNER to illustrate. Carbon does help to a point. The Wossner is a CNC finish, but if your hunting power there wont be any difference.
Problem with forged is the difference in thermal expansion to a cast alloy. MITAKA is a good choice for the DT.
https://c1.staticflickr.com/1/548/31277391110_2d27cd8549_c.jpg
Smooth yes, but a rough surface lends itself to optimising fuel atomisation, that is more important.