B.
Hard to answer since it's so relative to what you are use to. I also have a custom road bike which is obviously a lot quicker and I would reach for this bike if I were doing a long day ride. If all I had was the Sherpa, I would throw on some Pasela TGs 1.25s and and not look back. My LHT was a very fun stable bike but just a slug IMO but I have read where others consider it a great do all bike probably because it's their only bike and perhaps a recent upgrade from something even slower.
What do you mean by medium load touring and what kind of roads will be you be on? If you would be doing the occasional tour on pavement but mostly need a bike for commuting and day rides, you might be better off with something like the Jamis Coda series. Fast and nimble but OK for the occasional tour.
The Sherpa is a full on expedition touring bike so if you don't think you will have the need to install 2.0 tires w/ fenders, it might be overkill.
Having said that, it's nice to know you can and it's a fun bike to ride. Sometimes fun doesn't always mean fast.
Paul