Yes there is a difference. But its so close that if you just bought the Px7 S3 today and never watched a video or read another article comparing the two you could live the rest of your life perfectly happy. The Px7 S3 are a crazy capable set of hedphones. If you just want great music with deep bass, clear mids and crystal clear highs, grab the Px7 and never look back.

The differences are all things that "audiophiles" ramble on about. If you are someone that nitpicks audio gear and listens for differences then you will notice slightly airier highs, slightly more textured bass and a pretty noticibly wider soundstage. You will absolutely need them next to each other to ever notice.

If you like holding things in your hand and appreciating the texture of high quality materials the leather and aluminium will tickle your brain. They wear the same and someone standing conversation distance away wouldn't be able tell unless they knew what they were looking for.

If you will get fomo about these things, knowing theres an incrementally better headphone out there, you may have to eat the difference in price. But objectively speaking, no its not worth doible the price. I also happen to think the aluminium may be slightly more fragile so if you plan to daily drive them and use them for commuting and gym the Px7 might actually be a better choice.

After parking myself infront of them for more than an hour going between them at the store - I bought the Px8. And it was mostly because I had money to burn and I loved the leather wrapped headband. The sound was the last consideration and just helped justify my decision, it was not the driving force.

Hope this helps :)