Whenever I hand over, or take-over, from one of those flights, the Mixed fleet crew have at least one, if not two, crew members more than us so it's hard to believe that they are not completing the service. Their crewing level is more akin to our old matrix at present so with all the experienced flyers (albeit from other carriers) there should be no problems whatsoever.
Seriously sad to say goodbye to VIE, a real gem of a city with the best hotel on the short-haul network.