I have been shooting with my Nex-7 and Leica legacy glass for a bit now and I must say I really enjoy it. The focus peaking and focus magnification work really well. My 90mm Tele Elmarit Vers.1 is a super lens whether it's on my Leica M9 or on the Sony Nex-7. I use the Novoflex adapter as it is the best I have found to adapt my Leica lenses to the Sony. This lens is extremely sharp with plenty of contrast and a joy to focus. The shot below was done on assignment of a local politician under fluorescent lights with the camera on auto white balance. The camera put out a great jpg file, to bad I had the output set at rgb not srgb so I had to convert it. The image below has just been toned, slightly sharpened, and converted to srgb.
Exposure ISO 1600 1/125s f2.8
My complete rig is as seen below with the Leica 90mm Tele-Elmarit attached via the Novoflex adapter to the Sony Nex-7.
I used the focus magnification to zero in on her eyes because the focus peaking was not real strong around her eyes. If you look close you can see a highlight in her eyes which turned slightly red under magnification which showed me the lens was focused correctly. I could barely see it without the focus magnification on. I could pick it up with the magnification on which really helped. The Sony is a more advanced camera than the M9 and allows me to take many frames quickly unlike the M9 which will fill the buffer fairly soon. The EVF on this camera is excellent and allows me to see what I am getting. To me it resembles a small Leica M240 with it's features and ease of use. The thing I really enjoy about the Sony is the ergonomics. The twin dials which are right at thumb level I have set to shutter speed and exp. compensation. The dial on the back I have set to control the ISO. This combination works best for me but may be different for you. I have found that using the camera in shutter speed priority works best for my purposes. I hope to post some more images from this camera and lens setup soon so keep coming back to see.
I have posted several images with some of my other Leica glass that really got me excited. I have since auctioned off my 1958 50mm Summilux f1.4 Vers.1 Black Paint which worked perfectly on the Sony and the results were really cool. The shot below was made with this lens which I will miss dearly. I started my career with it back in 1978.