The Sony NEX-7 has been benchmarked on DXOMark.com. As expected, the NEX-7, with its mirrorless design, sligthly bested its larger sibling, the SLT Alpha 77. It even outscored the vernable A900 full-frame camera in all categories except low-light ISO.
One thing to take into consideration is that the A77/A65 just had a firmware update released today. DXOMark will have to rebenchmark the A77 with the new firmware to see if the scores change.
The firmware on the NEX-7 will probably also be tweaked in the near future. Retesting will have to occur when that happens as well.