Please have a look at: Why is a custom FBO not antialiased? - #2 by Mugen87
No. Right now, you have to use FXAA if you want to sharpen the visual output when rendering into a custom framebuffer/render target.
BTW: The term “quality” is very broad and can mean a lot of things in context of rendering. In my post, I have only referred to missing MSAA when using render targets.