boilerdoc2, here´s how i see the differences.
With M7II you can make multiple exposures on one frame. Viewfinder is more contrasty and the framelines are brighter on 7II. The exposure compensation dial is a lot easier to use on 7II, especially if there is something mounted on the flash mount. 7II has three strap lugs, allowing also horizontal carrying of the camera on a neck strap.
If i had a 7 already, i wouldn´t bother replacing it with a 7II.
Niko