Just purchased my first ever Audi and went straight for a 2016 RS6 PE (34,500m)

After requesting the dealer (non-Audi at this particular branch), to correct a few issues (low tread rear tyres, 38k mile services, broken O/F inter-cooler grille etc), one issue I couldn't get resolved was the breaks. I have had performance cars and bikes before but I wasn't happy with the surface and lip of the front discs. The breaking force also wasn't what I was expecting. The wear limit was such that a skim is not on the books and were not below safe operational levels, I couldn't get them replaced.
Like many others I have found some Aud OEM disks on eBay, but should I be concerned about disc revisions? I am also considering replacing the rears also?
TIA
Kenny.