Not sure about the ride in the CLA45 but in the A45 its stiffer than the GLA45.
Overall love the GLA45, if I had to be picky I would say the Harman Kardon sound system, although probably the better choice to the standard set up, lacks mid range punch.
Car should be serviced annually with A and B alternating ( one usually more expensive than the other ).
Make sure you clean the Alcantara on the steering wheel as it might have gone to smooth leather like feel....its easily restored back to softness though.
Enjoy it...its a fantastic car that received a fair mount of early misunderstanding from some online reviewers due to it being quite unique but it def has its place!