I've heard other photography pundits describe the Micro Four Thirds system as the new 35mm. Easily transportable and easy to use although limited resolution.
Likewise, because full frame systems (ex., Nikon D800) have such high resolution, they've become the new medium format.
Yes. I'm not surprised others have said that too.
I think it needs adding that this just comparison on principle. Because M4/3 system is in so many ways, including image quality, better than 35mm. And the same is true for full-frame compared to old medium format. Much better, faster, more flexible, etc. And now it's becoming mirrorless, it, like M4/3, is also becoming lighter and more compact. (It'll take a while to make all new lenses, though.)
In other words, they the equivalent of those systems For A New Century. M4/3 for serious-amateur and pro use. Full Frame for pros who are extra serious, or need extra-high resolution (or low light power), or still need to impress their clients with big, heavy, expensive gear.
... Not to forget, if the tech progresses in the next five years like it has in the past five, holy cow, it will far surpass those older systems. Just a couple of years ago, M4/3 was too slow in focusing for moving subjects, and it wasn't really any good over 800 ISO. That has changed dramatically.