^That thing makes about the same HP as a piped and jetted 599. The 599 is about 150 pounds lighter tho. The CB1100 is about 120 pounds heavier, and 40 HP less than the Duc 848. Specs, (numbers) sell motorcycles. That thing has bad numbers.
Feel is subjective, when it comes to fast or not. But I don't see how 565 pounds of motorcycle couldn't feel heavy.
I rode that heavy, old crap way back when there was no choice. But in 2007, KTM gave us the 990 Super Duke that weighed 410 when it was low on gas. I weighed mine. Mine dynoed 114.5, 70 lb ft torque. All day comfortable. Nearly 12 years later, there are still very few motorcycles that have numbers like that. Sure, they've upped the HP, but the weight has gone up as well.