Macro lens for Sony Nex: SEL30M35 or Vintage/Legacy manual focus?

To my knowledge, there is no 50mm macro out there faster than f/2.8, though I think Tamron has a 60mm f/2 Macro (it's modern though, not legacy).
By definition, the Sony macro will get you "closest" to your subject, in the case of distance from lens to subject. It's working distance at 1:1 I believe is just a centimeter. If you are instead talking about wanting a LONGER working distance so YOU don't have to physically get closer, the macro lenses with the longest focal lengths will be your friend. You could probably do portraits okay with the Canon 50 macro, but you won't be getting shallow depth-of-field if that's what you are expecting. 
For a relatively compact legacy lens capable of both distance macro AND portraits with good separation, you may want to give the Nikon 105mm f/2.8 AI-s Micro Nikkor a look. I'm in the process of reviewing it, and it's a stunner of a lens, one of the sharpest I've ever used.
http://matthewdurrphotography.com