NEX 6? Any downsides?

Perhaps within the Sony line, but some of the routine lenses, like the 55-200 costs $340 in Sony flavor but $246 in Nikon. Nikon is well known for having expensive lenses too, and it's not like the image quality from the Sony will be significantly better. There is a similar differential in the 50/1.8, and every other lens they have in common that I have looked at. You can get a Canon 50/1.4 for the price of Sony's 1.8. The one that really gets me though, is the frequently recommended 35/1.8, which out to be a pretty easy lens. Nikon: $200; Sony: $450.