APSC vs Full Frame? Image quality differences?

I think this is a widely spread misconception, since you will hardly be able see any differences at normal viewing distance even for 44 inches/1.1 meter wide prints. I have made a lot of tests with 12 mp aps-c vs 24 mp full frame for very detailed subjects.

What really matters for Commercial photography is content. The pictures the OP is linking to is taken at low ISO, tripod is normally used, the lens is stopped down, etc., which will make any format look good even from large format prints (4/3, aps-c, full frame).

For critical technical comparition mirror slam from the D800/D800e might affect fine detail so much that a camera like the 24 mp A65 or A77 will show similar or better detail!