Depends upon whether you want to reprofile the edge to a shallower angle, or merely sharpen it on the existing bevel. If you just plan on sharpening and NOT reprofiling to a shallower bevel, the Lansky will do it OK, along with many other normal stone type sharpeners. If you have a really thick edge and want to rebevel it, I would definitely buy a diamond hone. A coarse diamond hone will take off in 15 minutes what it will take three or four days to remove with conventional stones. I bought one Queen fixed blade before getting the diamond sharpeners that about drove me crazy. I ground metal off that thing for an hour a night for two weeks, and never did get to the edge to leave a burr. I was so angry that I pounded the blade on my back porch railing, and drove the tip into the wood trying to snap off the point and smash the thing so I could throw it away. I was unable to damage the thing at all, and decided that anything that tough might be worth salvaging, so I got the Lansky coarse diamond hone, and in fifteen minutes had a burr on the edge. Swapped to the conventional Lansky stones, polished it up, then hit the edge itself on a 22 degree fine ceramic crock stick, and that did it, hair popping sharp. That was the thickest Queen I have bought, most of them weren't that blunt.
I believe that if you're going to try to remove much metal on anything hardened over about 59 RC hardness, you'll be much better off to get a coarse diamond sharpener to do it with. D2, ATS 34, VG10, etc, they're all usually pretty hard and very abrasion resistant, but the diamonds will zip it right off of there in no time flat. If the factory edge angles are satisfactory though, conventional hones will work OK to resharpen. I like to use 17 to 20 degrees for the primary bevel, and then 22 to 25 degrees for a microbevel to polish up the very edge itself. My knives sharpened in this fashion cut very very well and hold up fine also. I have not tried any ultra shallow angles way down below 17 degrees, as on most knives it makes an edge bevel that is extremely wide and ugly. Good luck getting it sharpened up. :thumbup: