Yeah, really. The vintage gun looks almost nothing like the Joker gun to me. The Sideshow one at least has the thicker silencer part, looks more "modern" and is green. Sure, the magazine's in a different place, but that doesn't affect the look so much as having the aesthetic of something from the early Cold War.Really?!
The 25th Anniversary gun is pretty much the same as the Joker's gun far as I can tell, but that's not the vintage gun.