I have used legacy SLR lenses on the best FF DSLR equiped with the best focusing screen and a 1.35x VF magnifier, and yet, manual focusing on the NEX 5N is so much better and accurate that it makes the use of manual focusing lenses on DSLR a joke. I have the NEX 5N for 5 days and nailing focus with it using my Nikkor 50f1.2 wide open is just simply magic.
haha nice sig, next time learn manual focusing from you on the nex5n platform. i am still waiting for my adapter =p