No one, no one has ever done that, lol.
Realistically, there are certainly plenty of folks that would love a III, but for budget, redundancy, etc, they no doubt stick with a II. But.... all things being equal, and if someone said "you can have this III, or this II, which do you want, no strings attached", I can't see anyone choosing a II.
I don't think there is a single thing the II does better, except keep more money in your wallet. The III has better tone, better interface, more power, more routings, future firmware updates, etc. Its the flagship FAS product, and while anything in the FAS "fleet" in a great product, the III is out of this world
I mean look at the latest free update, which wasn't even a major firmware update
Harmonic and Bias tremolo effects, bigger tuner, new room settings in the cab block, new Fortin boost in the amp block, more USB audio routing options, new looper control options etc. The III, IMO, is starting to quickly pull away from the rest of the field, and it seems Cliff is just getting started.