I am going to add sandvik 14c28n as my top steel for folders with m390. When i know i am going to use my knife a lot, i have typically grabbed for the delica or the leek because they hold good edges but will be easy to sharpen when i am done. I had always preferred vg10 over 14c28n. To me they were always similar. But after i did a cut test, the leek beat the delica in the one category that i always considered the delica better in: edge retention. The edge is quite a bit thinner on the leek, but that is why i have always liked it so much for cutting. i always choose my leek over my delica for whittling sticks. However, i have always preferred the delica for edc. But overall, i love how sharp i can get the 14c28n on my leek.