I believe it absolutely is more desirable in most every case but I never seen a consistent % value increase.
It also depends on the pedigree. And the comic. Some of the less collected comics can get a bigger bump just so someone can say they have a Church or Okajima comic.
That's a good point. Some of the easier to find pedigrees -- Bethlehem, say -- don't seem to bring much of a premium on more common or less desirable books. I've bought copies of such books where the seller didn't even note (or maybe didn't notice) the pedigree. There was someone a while ago arguing that pedigrees don't matter except for the top three or four (Church, Okajima, SF), but I would disagree with that.
Other than on these boards, I don't really hear much about Okajima copies.
But for the ones I collect and have experience with (Larson, Church, SF, Recil Macon, Rockford), the Church books are the creme de la creme. Even though they no longer fetch 5X guide regularly, they do sell briskly at 2-3X guide depending on guide value. Very expensive books in guide don't command multiples though because they are already so high. The others I've mentioned typically sell for 2X
Please point me to where these Church books are selling for 2-3X guide. For most of the ones I'm interested in 4-5X would be a bargain.
For books very low in guide, sure, you can get 4-5X. Check out recent sales at the auction houses for information on the lower multiples. I know first hand, sadly, how the sales have gone of late. But, certainly for the right stuff, Church books still command high premiums
I don't think you can put any consistent range on Church books. My sweet spot is books in the $500-1500 range according to guide. For books I've had interest in over the past year (generally average to above average demand WWII era GA) I'm seeing results from 2-11X without much predictability to what will or won't go absolutely nuts.
If you're buying post-'1945 drek you can find stuff for even below guide at times.
My point is that to peg them all in a 2-3X window misses the mark completely. The variance isn't predictable at all.