The which is better debate has been raging for months on forums. There are camps that like one and camps that like the other. The really interesting thing is to look at the price that each is available for.
The Denon 3800 was being priced at £1250 for over a month before the price rises kicked in, now at £1400 odd.
The Pioneer 91 has not been seen below about £1450 as far as I can tell.
The Sony S5000es has been as low as £879 and is now available for £900.
The Marantz I don't know.
The RRPs are very different, and suggest that these products have been pitched at the same purchasers (pretty much). I think Sony may struggle to be taken as seriously by AVphiles. Maybe they'll change their mind at these prices. That's just my view. On outright ability, the views of those who've tested them elsewhere would put this as a shootout between the Pioneer and Denon. No telling who'll win. But when you factor in price, it is starting to be hard to ignore the Sony.
This is where WHFSV come in. Really looking forward to seeing where they come down and why. Good luck all!