In reply to Martin Hore:
I can't comment on any Sony cameras as I've never used one. However I have owned a crop sensor Nikon and I now own a micro four thirds camera. On paper the micro four thirds camera has the smallest sensor, and in a game of Top Trumps it should fair worst in image quality.
At the moment I have a Panasonic camera with a Panasonic lens. Its fair to say that Panasonic have not been making lenses as long as Nikon however they have been able to build lenses with modern technology and techniques for their new products. Having a link to Leica lenses and production techniques also helps with lens quality too.
Even though my micro four thirds lens has the smallest sensor, my observations are that the images taken with this camera compared to my Nikon crop sensor camera and budget lenses made by Sigma are superior in every respect.
My micro four thirds camera is lighter with smaller glass attached to it, yet it produces images that I feel are subjectively better than my attempts with a crop sensor camera.
Having a smaller sensor also helps with zoom lenses because they too can be smaller and lighter compared to crop sensor or even full frame cameras.
Last year I treated myself to a 100-400mm lens. Which for wildlife shots would be an advantage. But if you consider the micro four thirds magic then such a lens as mine would correspond to a 200-800mm equivalent on a full frame camera. Have you seen the size of a 800mm lens for a full frame camera. You're looking at 4.5Kg and a hole in your pocket north of £15,000 before you buy the camera to stick on the end of it.
I've used my camera plus 100-400mm single handed while bobbing around in a speedboat. That is the joy of Micro four thirds.
Here's an example of an image taken on a dull day at full zoom 1/500th a second. SIngle handed on a rib.
https://www.flickr.com/photos/the1lemming/37591319111/in/album-721576876564...
When I bought my Panasonic, I was seriously considering a full frame camera. Now that I've had my camera for over a year I am so glad that I took a punt because it is such a joy to have a light camera setup with excellent optics.
I haven't even commented on the video quality either.
Post edited at 16:39