I wonder what "RTL-34" is. I can't find any reference to it outside of K'roo Knives.

I have several Benchmades with ATS-34 and 154CM. ATS-34 is the Japanese (Hitachi) equivalent to 154CM and got popular here in the states around 2000 when 154CM was in short supply and/or was of poor quality (bad QC).

You can now get some knives in S90V which will hold an edge for a seriously long time but you need a diamond stone/rod to bring it back.