I've sat in the white Model 3 seats directly after getting out of my plain black ones. They're noticeably softer. That said, I like the plushness. The ride would be way too harsh if the seats weren't soft to absorb impact. A lot of American cars tend to be on the plush side. I'd much prefer plush to rock hard like on my BMW. My BMW has an incredibly smooth (not soft, smooth as in you don't feel bumps at all) ride and is super quiet, but I've sat in solid wood church pews that have more forgiving seats than the leather BMW seats I have. Their fake leather is way more soft and plush, but it doesn't come with ambient lighting.
It is kind of loud, but that varies quite dramatically based on manufacturers. We'll just have to lump the Model 3 in the "noisy" category. I've been in noisier cars so it's all pretty relative. I wished they used acoustic glass for the windshield. Just that alone would have made a huge difference.