I think I have all the DC OverPower. My favorite where the hologram cards.
Only bought a few of the Image. Supposedly they sold most of them to Japan, so they're kinda tough to complete.
I have all but a few of the Marvel. Missing 5-10 chase/promo type cards.
Now you may think you have holes in your collection, but perhaps not.
Not every character had the same number of cards.
Another interesting thing, is that a few cards are reversed, and I think one has part of the image missing. Mmmm, variants in the card world.