I certainly wouldn't consider myself an MBL "expert" but I did have an MBL obsession for many years, and was able to hear the majority of their speakers, often in very good set ups. I had always lusted after the 101s but they were too much money, and I lost out on a once in lifetime second hand pair bid, which always haunted me.
I've ended up with a pair of the MBL 121 stand mounted speakers, which use the omni mid and tweeters.
As for the comparison between the 111F and the 101E...
For some reason, to my ears, the 111F somehow lacked the signature tonal balance of the rest of the MBL speakers, especially the 101E.
The 101E has to my ears, in a good set up, a truly gorgeous tone that sparkles with a rainbow of timbral colors - from the "woody" quality of a guitar body, to the brassy tones of a trumpet, etc.
Whereas the 111F didn't seem to have the same voice. It certainly did the spacious omni-directional imaging thing we expect from MBL, but tonally it just seemed more subdued, darker, less believable.
I never figured out why, but it was a consistent impression whenever I heard them and I wrote them off my list. YMMV of course, and there certainly are happy owners of the 111s.
It's doubly puzzling because my 121 monitors actually DO share much of the tonal quality I loved in the 101Es.