I don't know... I find it more relaxing to use my knife.
Both, SK-5 and 52100 take scary sharp edge very fast. But 52100 can also hold that edge for very long.
So far I didn't have to sharpen D2, but I didn't get my hands on diamond sharpener yet either, so we will see how it goes. I won't even use it till I have my hands on the sharpener.