Years ago, I shot newsprint ads for a local department store. They had me do a spread of luggage that would run double full page on the back. Because I was out of smaller Polaroid, I shot it with 4x5 sheet film and turned in an 11x14 print, wondering if it was worth the extra trouble and expense of doing it on 120 roll film. What a shock! It looked astonishingly better.
I bring this up because of the astonishingly better jpegs, 72 dpi, 11x14", 12 quality, that come off of my Phase One P65+ back. Non-photographers call me and ask me what camera I'm using to get such sharp clear jpegs.
I think this relates to people saying that for most jobs, 60 megapixels is overkill. Maybe not. Even is Sensor Plus, a 15 megapixel file blows away 16 megapixel Canon files.