IME sportbikes have heavier feeling steering due to ergos (bar position/height). It's a matter of leverage, the posture of your 14R gives you less leverage on pushing the bars, where as your CB500 gives you more. At the same time, your 14R gives you more leverage on turning the bike.
My VF1000F had lighter feeling steering than my 14R. It was easier to push the bars to go whichever way. My friend had a VF1000R, which was the supersport version of the VF1000s and had the lower bars. It's steering felt much more like my 14Rs, much heavier. At the time I also rode a couple other bikes, a friends tiny FZR600 had the same heavy feeling and it's weight was comparable to today's lightweight supersports. My 1000F was faster than both though so nana-nanana on them! But I digress...
But it's just a difference in ergos and how the bike is meant to go around a corner. Give yourself a little time, you'll be maneuvering low speeds no problem on the big 14R and as you get acustomed to the ergos the steering will come more natural compared to your FJ or CB.
ust as an aside, before I bought my ZX14 I test rode the Ninja 1000. It is a nice bike but to me it had absolutly no personality. It was kind of boring, a little like a few Hondas I have owned. It did everyting well but just didn't have any sizzle. Then I test rode a 14. And that was that. The ZX14 is the best bike I have owned, hands down.
I sat on a couple other bikes, but only test rode the 14R. I knew instantaneously this was the right choice, it was the most of what I wanted (big power, sporty handling, great looks, fast, etc.). In a lot of ways, I was looking for the modern equivalent to the VF1000F I had.
This bike is 11/10 fun factor, and it's also a pretty serious performer too even cornering. On other forums fun comes up once in a while, and people tell me their bikes are as fun (or more) than the 14R. I loved my old VF, it was a lot of fun. Compared to my 14R, the VF falls so far short on going out and having a blast. I just know these people who tell me they have as much fun as on the 14R they just have no concept of it.