Car novice question: Why does my new car not perform as well as its predecessor

Here are the specs of each model on Parker's guide:

Old car:

                    Ford Focus Hatchback 1.6 Zetec 5d specs & dimensions | Parkers
                

Find all specs on the Ford Focus Hatchback 1.6 Zetec 5d, from fuel efficiency and top speed, to dimensions data and more.

www.parkers.co.uk

'New' car:

                    Vauxhall Astra Hatchback 1.6i 16V Design 5d specs & dimensions | Parkers
                

Find all specs on the Vauxhall Astra Hatchback 1.6i 16V Design 5d, from fuel efficiency and top speed, to dimensions data and more.

www.parkers.co.uk

There simply isn't any way that the newer car has the same power behind its acceleration than the old car. Can someone point out what I should have been paying attention to?