The .25 Diamond is a very selective paste, it doesn't work well on all razors...
One of the most used combo's of pastes that works well on almost all razors is the .50 Diamond followed by .50 Cr this is nice, sharp, smooth, feeling combo...
If by chance you have a razor that likes the .25 Diamond there is nothing sharper that I have found "YET"

If you use it though I would recommend stropping the stuffing out of the edge afterward, I follow all pastes with 50 laps on linen and 100 laps on leather......