As of recently, I incorporated diamond plates into my sharpening lineup. A while back Dr. Naka told me that a professional sharpener in Sakai told him that his preferred method of sharpening knives for longest lasting edge was on a diamond plate followed by a finishing stone.
I have been thinking recently how to get 52100 sharper and decided to give this method a try.
I used DMT Extra Fine (1200 mesh equivalent) and followed by a J-nat finishing stone in 8-10K range and finished the blade on 2 micron spray felt. I really liked the edge I got and I am using this knife at home now.
Upon Devin's suggestion, I got 11x2.5" DMT diamond plates. The extra length is really nice, as it allows me to sharpen in long strokes.
For that size, no base was available, so I made a wooden base for it from walnut. Checking the plate for flatness, I was pleasantly surprised that the back side was flat enough to use as a stropping base.
After a little tweaking and embellishing the base, I got myself a prototype sharpening/stropping setup.
The setup (bases, plates, strops) will be available for sale in a near future.