Yeah I wanted to get in before he posted his guitars!
I know what you mean about "that sound", though. Martin has defined what the acoustic guitar is for well over a century, pretty much everything else is a response to them. And when you play a Martin, you think, man, there's that sound that I know. I even played some of those CEO-7 guitars, which is basically Martin making a direct replica of a Gibson L-00, and those CEO-7s still sound like Martins. Not only do they sound like Martins, but they sound a lot like Martin dreadnaughts. It's kind of cool.