I traded my MKV Gti for a 335i Sport.
My first test drive was a 328i luxury and I was really not impressed did not feel like I was upgrading from the Gti. I then test drove the 335i Sport and it felt worlds a part from the 328i luxury. I will say even on the 328i there are still some disappointments like the steering wheel is not thick enough and I really want to change it sometime soon. I cant give a comparison on suspension as I had a full coilover system on My gti and I had purchased H&R Sport springs before my car was delivered so those were installed right away!
