I wanted to see how a camera like the Fujifilm X100s would compare to a Canon 5D mark II and an L lens. It's a fraction of the size, weight and price. Below are some tests:
The difference for me is significant, but I think the convenience of having a pocketable camera that takes pretty decent shots makes it worth having (especially as I spend most of my time these days chasing round after my 3-year-old daughter).
With post processing:
Unprocessed (straight out of camera):