NEX-7 with M lenses
You may wish to reconsider as the NEX-7 is not very good with wide M lenses.
I have used it with the following
VT 15mm - very bad magenta cast and blurry edges and corners that marginally improve stopped down.
VT 25mm - moderate magenta cast and not sharp in the corners improves stopped down (not the cast)
VT 28mm f2 - hardly notice and cast but not sharp in the corners until f5.6
I used these lenses on a nex-5n before the 7 and they performed really well. Different sensor layout in the 7.
Love the 7 but wish i had also kept the 5n!!