Out of those 3 (Sony, Denon & Marantz) - The Sony will lag quite a way behind. It's also an old receiver. For example Denon has replaced their 2000 and 3000 receivers twice since Sony brought out the 1080.
The Sony will also be a lot cheaper.
I guess it depends whether or not you are wanting more of the latest features like HDMI 2.1 and eARC etc.
I read on another forum some following points on the Sony:
Do a bit of reading in the Sony STR DN1080 thread and you'll see it does have some issues.
I have one, it sounds great, however I wouldn't buy another if it went phut.
1/ The GUI is slow
2/ As above, it's old. Denon have replaced their similar model twice already in the same time the Sony has been out.
3/ DTS-X and Neural-X don't work with overhead speakers, there's no reason for this as all the competition do it, but Sony refuse to address it as "it's not in the specs for DTS-X".
It's a simple firmware fix, but no, they won't do it. They won't be getting my money on my next AVR.
I've not heard any of the new Yamaha receivers and What Hi-Fi have recently reviewed the £899, 2A model giving it 4 stars. The 4A model that you mention is a few rungs up the ladder from the 1080.