Older tyres (and rubber in general) tend to get harder and louder over the years. So it's not unusual that the new tyres are very quieter than the ones they replace. It is quite difficult to compare those two, old and new, tyres objectively.
I'm currently looking for a set of 4 new tyres in 235/40 R19 96Y and I have narrowed down my search to 3 models : Pirelli "P Zero Nero GT"
(~150Ä), Falken Azenis FK510
(~125Ä) and Nexen N'fera SU1
(~100Ä). I have made my choices based on various "professional" tests and public reviews.
My current 19" tyres are the Bridgestone Potenza RE50A, which have good grip and precise steering. But they are not very comfortable and they are really loud inside the vehicle. I am currently driving with 18" Nexen Winguard Sport 2 WU7 winter tyres. Those tyres are really comfortable and quiet, steering is still precise and the tyre wear seems very good, even on dry roads we mostly have this winter.
Note that Pirelli has different P Zero, P Zero Nero, P Zero Nero GT, and they are all a little different. The latest with GT at the end seems to be a good tyre, better than the previous ones. But it's the most expensive of the three. Its the best looking tyre, which is a stupid argument, I agree
The Falken gets a lot of good reviews, but seems to wear rather quickly.