I took two copies of the same 2600 cart, stuck one in the 2600 and one in the 7800 turned both machines on then flipped back and forth between them. The picture displayed from my 6-switch 2600 had really vibrant colors and the 7800 seemed a lot duller though maybe a bit sharper. Is this common? Does the 7800 produce a duller image overall, at least on 2600 games?