Full leather equipment at the 8er

When configuring an 8 Gran Coup I stumbled over the 3,600 € surcharge for the full leather equipment. After some research I only found out that the Kardan tunnel is also leathered, but that can’t be everything for such a high surcharge, right? Besides, I wonder if there is the caro-stitching on the picture also on the normal 8er or is it only for the M8 to have? There doesn’t seem to be even beautiful decorative seams at the moment or oversee i What? For example, you could get blue seams at the 5s. Is there something about BMW Individual for the 8s?