i have this lens that i recently got, but it is a tad short for me on the nex.
the lens has been modified to focus closer the 1m, CFD is now at around .6m which makes it much more usable.
you can see in the pics where the lens goes passed the 1m mark.
the focusing ring spins smoothly as well as the aperture.
this is the m39 mount version, which can be used on the nex or m4/3 cameras with the m39 adapter available on ebay.
i have a couple samples shot with my nex wide open at f1.5, these are straight out of camera. the lens is pretty sharp and gets sharper as you stop down.
$159 shipped and paypalled