Thought it might be fun to post a few thoughts on the CB500K0 vs. GL650 (1983).
I'm new to bikes, and have put about 500 miles on my CB500K0 since purchased in August. Before that, I trained on a 200cc Yamaha, and had never ridden any other bikes.
This weekend I picked up a 1983 GL650 Silverwing for a friend and drove it 120 miles home.
I was immediately struck with the riding differences. It's hard to believe I could have been so spoiled in a mere 500 miles, but when I got on the 650, I couldn't believe how rough and lumpy 2 cylinders felt in comparison to the butter of an SOHC four. The incessant vibration at speed noticeably increased fatigue on the ride back home. When I'd sit idling at a stoplight, I'd look down at the rattling and shaking gauges, bars, and tank and wonder how anyone could stand such an unrefined bike.
At speed, the 650 was noticeably top heavy, and felt much less sure footed into curves. The suspension, while softer, felt floaty and imprecise. It really felt like much more of a balancing act to keep the bike upright and moving in the direction I wanted. The extra weight of the 650 probably made it worse.
I ended the day amazed at how sure footed and stable the CB500 was in comparison.