Probably the most profound wake-up call on IQ you/I will ever read...

The main problem for me with the comparison, notwithstanding the viewing limitations of a small compressed jpeg, is that the image is taken in very good light, without the need for a shallow depth of field, without the need for a very fast shutter speed, etc...  Small sensor cameras can make very good images in the right conditions, but they are not flexible enough tools for many other conditions.