Portraits: Biggest Blur for the Buck

Nikon D600 + Nikon 85 1.8G.  f/1.8, 1/800, ISO 100

This question was posted on DPReview and I thought it is a useful question: "What is the greatest amount of blur you can get in the most compact package for portraits?"

Update: thanks to readers' suggestions, I added Fuji 56 1.2, Samsung 85 1.4, and Nikon 135 f/2.

Different Cameras & Lenses, Same Point of View

This should be an interesting post to some of you, see that swing in the picture? I take pictures of my daughters ever year in the summer on this exact swing, where they spend the summer vacation time by the seaside. I wanted to make a comparison between the different pictures taken from the spot, with different cameras and lenses, over the years.

What camera/lens combination would you say was used to capture the above picture?