A buddy of mine that has a BMW RS 1200 loved the look of my X road and was considering buying one - he took a X country out for a test ride and liked the way it handled but said "I expected the 106 to be more satisfying power wise". Personally I was always happy with the 106 - is the 1200 RS really a more "satisfying" motor? I told him that you can add ponies by pulling the strip, new filter, pipes and PC5. But he has pretty much moved on. I believe that was his true impression - good guy and money is not an issue...he's loaded. An example of not buying after a test ride....
Well, they're completely different bikes: a sport-tourer -- with the emphasis on "sport" -- vs. a cruiser-tourer, so I'm surprised, too. I mean, before I do a test ride, I'm focused on what sort of bike and experience I'm looking for.
That said, those 1200cc Beemers make about equivalent HP and torque as our bikes, and weigh hundreds of pounds less. The current R1200R, for instance, is listed as having 110 HP and 88 FT-LB (although that's probably at the crank, not at the rear wheel)... while weighing in at 509 LB, wet, i.e., ready to ride. The R1200R is what I'd call a "standard," while the R1200S is sportier; that S is not a current model, so its numbers may be slightly lower, but it also may be slightly lighter, too.
In my younger days, I had an R850R (from 1997-2000). Now, my riding buddy has a 2012 R1200RT. We swap bikes occasionally on rides, and that thing can blow my XCT into the weeds. But, the seat is way high, your knees are bent back, it doesn't have the storage, etc. -- that is, as I say, a completely different animal. Nice bike, but certainly not my cup of tea (or anything else).
So, IMHO: A) he has a point, sort of; B) I gotta wonder why he was doing a demo of that kind of bike in the first place. If what he wants is a satisfying motor, I'd suggest he start demo-ing Hayabusas and suchlike.