Despite being 200kg heavier, 10 HP underpowered and with a slow start, Astra is the same as Golf VI GTD.
General impressions are that the astra pulls better across the RPM, is bigger and roomier...
Opel Astra J 2.0 cdti, SLOW UNPREPARED START, 1956 cm3, 160 HP, 380 NM, weight: 1515 Kg
http://www.youtube.com/watch?v=UhZIJNsFgKs
Volkswagen Golf VI GTD manual, 1968 cm3, 170 HP, 350 NM, 1329 Kg
http://www.youtube.com/watch?v=4-65G6H691Q