Correct, the median flush is KJT42 (!) but I certainly can't take credit for discovering it.
http://www.rgpfaq.com/ranking-why-flushes.html
A KT-flush is still an above-average pat hand because there are so many more straights than flushes. (About 2x.) Out of the ~20,000 pat hands possible it's somewhere around 7000th.