When I compare my camera which is dx (crop body) and to a friend's canon 5d mk2 it seems to give a lot more blur to the image. Why?
Short answer (because I'm sure this has been answered but I can't find a really good example):
With FF to fill the frame with your subject you have to either
- get closer (which means focussing closer, hence shallower depth of field, more blur)
- use a longer focal length. Which means a larger physical aperture for a given focal length, hence more blur