Attachment 2972
I also considered the CB1100. I like it a lot. However, apart from the F6B I also have one of these. A 2002 version of the CB750. Similar to your Nighthawk.
I found the CB1100 to be physically the same size as the CB750, with the disadvantage of requiring more frequent servicing and of course valve clearance adjustment, which the CB750 does not require at all, due to hydraulic tappetts.
The bonus with the CB1100 is fuel injection, more power, more mpg and the option of ABS. I could not justify the financial cost to upgrade because the CB750 does the same job with minimal outlay, as well as adequate performance for a naked bike.
If the CB1100 is your type of bike, I don't think you will be disappointed.