I've done a SS1000 on both a ZZR1200 and a ZX14. Somehow I think that you prefer to spread your thousand miles out over a longer period of time, but it certainly can be done in a day.
Only problem I have ever had with sport tourers on long rides is that you are more or less locked into one leg position. Doesn't matter how comfortable that position is, your knees still get sore from staying in the same position in my case for anything over 600 miles in a shot.
I am seriously considering a Concours 1400 in the future. I started my ST days with a Yamaha FJ1100 followed by two 1200s but the FJR is a bit small for me compared to the Kaw. If it isn't a Concourse, it will be a Triumph trophy. I loved my Speed Triple so I am excited to try one of these bikes out. ST is awesome but I have never been able to bond with Honda.
To go back to your question, if I wanted a touring bike for strictly touring, it would be a Vision or a big ol BMW. The next step down in my eyes puts the CR, XR and Sport Tourers in very similar categories. Although it is shocking at how well some of these ST perform, they also do a great job eating up the roads. Same with the CR and XR although obviously to a lesser degree.
2006 Vegas 8 Ball
2014 Harley FLHTP (Keeping service techs busy)