Yeah, I agree. When this first happened, I immediately thought of JMcD. Everyone said SP but I think people forget about JM cause it's so much further in the past. But the circumstances were eerily similar, in that both had two young daughters and their wives were pregnant with sons and there was cheating going on on behalf of the perpetrator. It's also weird to me (though obviously coincidental) that CW hails from the Fort Bragg, NC and that's where JM was stationed when he killed his family.
They also both had/have outlandish stories, though I gotta give JM the credit here on being the more creative of the two in his fairytale.
The difference is the level of intellect. CW has shown us that he is completely unable to lie, regardless of how well he tried to hide it. His story was unbelievable from the get go, but coupled with his incredibly inappropriate affect and mannerisms, my dog even knew he was guilty.
JM also had a ridiculous recounting (and his appearance on Dick Cavett was a whole different story) but he DID get away with the murders for nearly a full decade. He was very intelligent, an accomplished serviceman and doctor, well-educated (Princeton), charming, charismatic, and outgoing. Totally different from CW, who by all accounts seemed withdrawn and seemingly in his wife's shadow.
I highly recommend Fatal Vision, for anyone looking for a good read.