Jeff, what wheel size / tyres are on the car? My S-Line came with 18” Nexus N’Fera SU2 (I’ve never heard of these before, but apparently they are also OEM on Porsche) and I have found it to be a lot quieter than my old A3 8V that was on 17” wheels / tyres.
Also, as you say, comparing with a larger model will never be a fair comparison.