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ch-aviation reports the hand-over of D-AIXA at a ceremony at Toulouse-Blagnac on Monday 19 December 2016; Airbus's[3] press release is dated 21 December 2016 but names no day, and the aircraft flew on to Munich on 21 December.
Wikipedia's A350 article says the A350-900 "typically carries 300 to 350 passengers over a 15,750-kilometre (8,500-nautical-mile) range" with a 283-tonne MTOW, that the airframe is 53% composites, and gives A350-941 dimensions and Trent XWB-84 thrust.
Airbus's own press release, dated 21 December 2016, confirms the Lufthansa Group took delivery of its first A350-900, to be based at Munich flying Delhi and Boston routes.
World Airline News reports the aircraft, registered D-AIXA, was delivered on 19 December 2016 and landed at Munich on 21 December 2016.
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