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Possible Duplicate:
When do the differences between APS-C and full frame sensors matter, and why?
Why does a bigger sensor lead to a shallower depth of field?

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?

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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)

Or

  • use a longer focal length. Which means a larger physical aperture for a given focal length, hence more blur

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