Austrian Airlines will be starting Vienna-Mumbai service this October and increase service to New Delhi from five to six flights per week.
I've never had a chance to fly Austrian Airlines (though I am considering a trip to Iraq with them) but I've heard some very good things about their service and would also love to return to India. LH F is LH F, but OS's two-class Business Class is almost like getting First Class for the price of Business Class.
Austrian also occasionally offers discounted Business Class fares on their intercontinental flights. I'll be keeping my eyes out for deals.