Ah hah! At first I didn't think I had any Scrap Yard action shots, but I do! How about these?
Here are a couple of some Rangers. While I didn't do a side by side comparison of the Dog Father and the RD9, I think my Dog Father is a better chopper than the RD9, but the RD9 seems like it could be better as an all around use "big" knife. Unfortunately, the RD9 was a pass around that I got to use for a week, so I don't actually own it.
When the SOD I've ordered arrives, I'd love to compare it a bit to my smaller Ranger (although the smaller Ranger I have is about an inch shorter than the SOD should be).
Just for fun, here's one more of my Dog Father and a stripped SOG Seal 2000.