I read a 5-bike review of sport touring bikes back in 2005 or something and they said the ST was the most comfortable for the passenger, and in a nod to my wife. I bought the ST instead of the FJR or Triumph or BMW
Were I looking for a 2-up sport tourer these days I would certainly give the Suzuki a test ride (I'd also ride the NT 1100) but my wife no longer rides with me, so I don't need a 125 hp 2 up transcontinental missile anymore. I enjoyed my 2018 FJR (particularly with the updates it had over the ST... less weight, cruise, heated grips, 6 speed trans) but again, it's more than I need these days.
BTW Chuck I too consider myself a liter class I-4 guy. I just don't have one anymore which makes me sad