That $1684 PF was relisted and and sold for $1100. Let's also not forget that the base on this PF has original head sketches as well as signatures by Finch and Nauck. Not exactly a fair comparison. Most green PFs are selling between $950 and $1200. That's still good coin but not as much as you make it out to be.
The Com is increasing in price and the listing that sold for over a grand is legit. I know that the prices have fluctuated on the Com but they are on average rising. Also, don't forget that the Com was released about a year ago. It doesn't have the time in the aftermarket that the PF has.
I really don't care which statue collectors like more or less. Collect what you like. I know which one I like best and it's in my collection.