I am interested to know too but I think even a test like this is not going to be conclusive.
Just take this as an example, I was at the dealer 3 days back testing out two S2 Stratum before buying it. I noticed that one had a tighter beam and runs brighter and the other piece is a little more floody and the hotspot looks a lot dimmer than the one that I had bought. They are of the same production batch but yet there are differences in terms of brightness.
What I am saying is between 80 and 110 lumens, the difference is so little that it may not be noticeable and considering that Surefire rates their light from the lowest performing emitter, there is a chance that the 80 lumens one might be the same in brightness or maybe brighter than the 110 lumens version which happens to be the dimmest of the 110 lumens.