Support BladeForums! Paid memberships don't see ads! Please see our last research comparing sharpening high vanadium knives using aluminium oxide versus CBN/diamond abrasives. This comparison has been done on knives with vanadium content of 1%, 2%, 3%, 4% and 10%. Link to the report on the BESS forum: http://bessex.com/forum/showthread.php?tid=324 Printer-friendly version >> Excerpt: "Numbers tell us that edge rolling does depend on whether we sharpen with aluminium oxide or CBN/diamond, and CBN/diamond gives better lasting sharpness than aluminium oxide, but correlation with the vanadium content it is not linear – instead, there is a dramatic rolling in edges with vanadium content of 3% sharpened with aluminium oxide."