Probably the age differance between the two. Both are very nice guns, but the harder to find CZ-52 ammo (unless you convert it to 9mm) probably has something to do with it to. If both were the same price, I bet many would buy the one with the cheaper, more readily available ammo. When you make it more of a bargain price, then people will re-consider. Not that I would agree with that position, but I bet that goes through a lot of minds...