Do to budgetary constraints (retired on a fixed income now) I went with this setup to use all my old lenses and current ones on.
While I would have preferred going full frame with an A7, the NEX 7 has worked out well so far.
This picture was shot with my D7000 using a Micro Nikkor 55mm 3.5, ambient lighting at ISO 2000, f8, 1/4 second.
I haven't shot a full frame camera, other than my film cameras so can't say whether I'd be happier with a ff digital or not. So far I'm sticking with the DX stuff.