I found these photos and thought I would share. The top photo is what 5lbs of fat looks like and is the same weight as a house brick. It is quite scary to imagine that around your vital organs, isn't it?
The photo underneath that one is a great example of how 5lb fat looks compared to 5lb of muscle. This clearly illustrates how much less space muscle takes up compared to the equivalent weight of fat.
So a muscly person weighing the same as a fat person (if height and other factors were the same) would look much, much slimmer.
Now, 'scuse me while I go find my dumbells!