Yes a lower grit in the 8K range is more resilient as you suspect...within reason. You can actually overhone on 8K, however it's not so easy as with higher grit stones. The easiest to overhone was the shapton 30 k, I found only a handful of razors that could handle it. My CF does impart a very sharp edge, but I only use it on my harder blades & can't really comment on a softer edge like a old sheffield