The Sony NEX7 with the Sony Zeiss Sonnar E 1,8/24ZA seems to be a nice combo for a walk around camera. The lens is slightly larger than I would have expected but feels good in your hand.
The NEX7 seems to have the controls set up well for shooting in "Manual" Mode. The twin wheels on top work well as Aperture and Shutter Speeds although I always turned the right wheel first, even though I thought I was on the left wheel. It will take a few more days to get the feel down without having to look at the camera. Only an issue if you use a viewfinder like me, since with LiveView you would see the wheel.
The only other issue I have had with the camera is my large thumb moves off the thumb bump and right onto the "record" red dot. Sometimes I put the camera into record mode without knowing it. I'm sure I'll figure this out as well.
These shots were all done from a moving boat while I was hard at work. Yes, that's me with the bass. They were done at ISO 200, manual mode, either F8 or F9, AWB, straight jpegs from the camera.
If you need a Billingham or Domke case for your NEX7 check out my retail store.