I think it depends a lot on your application. I am an amateur photographer, for me the maximum output is 10x15 inch prints, for that I find 6mp 2.5mb jpeg files are fine. I have shot product images for money and they were in a controlled light environment so I did those in jpeg also.. I accept that were I shooting for money, and had a retoucher, then it would make sense to shoot the apparent maximum quality my camera could take which would be 12mp raw RAF files. But for me, as an amateur, the file sizes etc are too large.