Sony Fullframe versus APS-C image quality

FF vs APS-C (dpreview forum)

A guy tested following three setups:

A850 + Minolta 50/f1.4
A850 + Minolta 24-105/f3.5-4.5
A700 + Sigma 17-70/f2.8-4.5

The results are obvious, fullframe hs the edge.