I just weighed porker cat and he was 6.65kg. He's just a standard sized moggie and he is now on a stricter diet than before. He's only 3 and I feel guilty about his size.
No. 1 cat weighs 6.4kg but is much larger and lithe and sleek and a healthy weight for his size. He's 7.
My parents cat is tiny and dainty in comparison (3kg) but I always seem to end up with hulking brutes.