I ran across this old article from 2013 comparing the ST11 to the ST13. Nothing earth shattering, but still an interesting read.
www.visordown.com
Road Test: Honda ST1100 v. ST1300
Beloved of the happily middle-aged (and the police), unobtrusive, but more than capable of letting fly on a twisty road, Honda's ST1100 was a marvelous thing. Can the same be said of the ST1300?