I owned a clean old CB750 back around 2001.
I agree while it was fun, it is no comparison whatsoever to the CB1100.
Would I own it again now? I'd have to think long and hard about it (which I guess means no).
Part of me says just as a toy spare bike- but then my rational side of upkeep cost and hassle vs reward.
Related thought-
It is actually this same concept that brought me to the CB1100.
I wanted a motorcycle after a few years and found myself casually looking around Craigslist when I found a guy selling an old Kawasaki KZ750 LTD. That was my favorite bike I had owned. Much fun was had with it back when I was in the Army.
I managed to get my wife to go with me to look at the one on Craigslist- in case I bought it and rode it home.
Well- rose colored glasses and all that. The LTD just didn't feel right.
That is how I ended up getting the CB and making it what it is now.