I was thinking about how to explain my question a bit more and then realised I could work out the answer.
I wrote a small python script to count all the badugis one can be dealt.
715 badugis in total
4 high: 1, 0.1% of tot. Cum 1, 0.1% of total
5 high: 4, 0.6% of tot. Cum 5, 0.7% of total
6 high: 10, 1.4% of tot. Cum 15, 2.1% of total
7 high: 20, 2.8% of tot. Cum 35, 4.9% of total
8 high: 35, 4.9% of tot. Cum 70, 9.8% of total
9 high: 56, 7.8% of tot. Cum 126, 17.6% of total
10 high: 84, 11.7% of tot. Cum 210, 29.4% of total
J high: 120, 16.8% of tot. Cum 330, 46.2% of total
Q high: 165, 23.1% of tot. Cum 495, 69.2% of total
K high: 220, 30.8% of tot. Cum 715, 100.0% of total
To answer my example, a J-hi badugi is a favorite (53.8%) over any random badugi.
Nearly 31% of all dealt badugis are K-high etc.