In reply to Rob Parsons:
> For those kind of rock routes, if you have a full topo with French grades, then the alpine grades are (in my opinion) an irrelevance.
Indeed. Though you can apply a bit of common sense, for example the 'TD+' of a modern part-bolted route like
Bienvenue au Georges V (TD+ 6a+) is not the same as the 'TD+' of the
The North Face (TD+ 6a).