I hope I'm wrong, but with those specs it makes sense. Also, I don't think those prices will last long, they will be the early adopter fee; but for all others you'd have to be willing to wait at least 6 months to benefit from a price drop. And actually, the price for entry will be far higher if you want to go with native R mount lenses. Otherwise you are stuck with EF lenses and the adapter.
Another pricing clue, although I'm not sure how accurate it is; I've seen the lensrentals rental price compared to the 1DXIII's rental price several times now, below is a quote from fstoppers
Pricing remains a mystery. Major retailers say “Coming Soon.” Interestingly, however, Lens Rentals has it listed at $271 per week (hat tip to docsmith). Given that the 1D X Mark III is $347 per week, a little bit of math puts the R5’s retail price a shade over $5,000. So, $4,999?
I do not think the Sony comparison however is entirely fair, I've picked up a couple of Sony's in the retail stores just to hold them and to try to see what all the fuss is about....the build quality, ergonomics, menu system, color science, etc. etc. is night and day vs. a Canon. So yes..Ford makes tons of cars that go from point a to point b, but that does not mean that BMW needs to compete with them on price.