Upload & Sell: Off
I have a lot of cheap pixco adapters from different sellers and they are all good and mostly focus past infinity. Recently I bought a Fotga PK/NEX adapter and it is total crap. It does not even screw on the camera. (BTW only € 6,- or something)
If you want better and more expensive go to Metabones, Hawks or Novoflex.
Metabones and Novoflex seem to be a bit on the expensive side for a metal tube with a mount on them. Then again, consistently tight tolerances and stuff would cost a bit extra I presume.
Going by your advise I picked up a cheap €12 adapter from Ebay (Rainbow imaging). I saw the Fotga ones as well but do understand why you would not want to touch them. Will see how this one turns out.
So now all I have to do is wait for the NEX 5 and adapter to arrive, stick the 55 f1,2 S.C on it and snap away,