You could argue that, but you can't really claim (as some have here) that most are cross-shopping them based on car mag comparos. Its obvious by the prices you posted that BMW intends to position the 6GC closer to the Panamera side of the market than the A7 side.Base Pricing in the UK is
6GC: £59.6k
CLS: £51.2k
Panny: £63.2k
I think you could argue that the Audi A7 (base price £48.7k) also competes in this 4 door coupe segment (as C&D have done here).
The 6GC is priced significantly above the Audi and Merc equivalents. I would agree with C&D (and a few other mags as well) that the 6GC is relatively expensive.
The 6GC is relatively expensive, compared to the A7/CLS. No one is debating that. Nor can anyone debate that the 6GC is relatively underproduced (and thus, the pricing scheme can make perfect sense). Audi sold over 37,000 A7s last year. In its first (and perhaps best) full year, the 6GC may be lucky to pull in, what, 5-6000? When Audi sells 7x's as many, it's considered shrewd/clever marketing. When BMW asks a 22% premium, but is only selling 13% the volume, it's considered greed.
Is it relatively expensive compared to the Panamera? Doesn't look like it. And there can be a huge leap between being "relatively expensive" vs being "overpriced." The former is an assessment we can make based on pure, cold magazine stats. It sometimes agrees with the latter, but not always and there are many instances where the two are not in agreement. An RS5 can lose to the M3 in a C&D comparo; that doesn't mean the RS5 is overpriced, a fact that I'm sure Deckhook would agree to but doesn't want to admit in this thread as it would undermine his argument against the 6GC.