I would like to see a photo...

I can honestly say I've had more issues selling prints because of matching the decor of the room they are looking for a framed print for than by any camera body's lack of apparent IQ.

WE look at prints differently than the average consumer.  they want to match and have a print that accents their living space ... when we see a print we get right up to it, and check out the detail.

as we print, the observer distance also increases for normal poeple looking at the perspective of a print. we of course don't do that - and some people will check out the fine detail, but not in the order or (well, the photog could have used a D800E  and set the aperture at f5.6 and this would have been better - I wont' buy it because it's obviously inferior).

how do paintings sell?

some aspects suchs as stock photography obviously is different . however, if you are selling prints .. so many other variables are at play that the actual camera / sensor being used is such a trival importance.

My best selling print .. from a 20D.  one of my other best selling prints? a digital rebel 6.3Mp that I was out just testing to see if it was working correctly with the 18-55 original lens.